US3529785A - Electrical control system for turnover web rewind stand - Google Patents

Description

Sept. 22, 1970 v.J.M|sTELE '3,529,735

ELECTRICAL CONTROL SYSTEM FOR TURNOVER WEB REWINP STAND l 3 sheets-sheet 1 Filed sept. 12, 1968 Sept. `22, 1970 v..1. MlsTELE 3,529,785

ELECTRICAL CONTROL SYSTEM FOR TURNOVER WEB REWIND STAND Filed sept. 12, 196s s sheets-sheet 2 17mm/ff Sept. 22, 1970 v. J. Mls'rr-:LE

Filed Sept. 12. 1968 ELECTRICAL CONTROL SYSTEM FOR TURNOVER WEB REWIND STAND 3 Sheets-Sheet 5 Ziff United States Patent O 3,529,785 ELECTRICAL CONTROL SYSTEM FOR TURNOVER WEB REWIND STAND Victor J. Mistele, Colgate, Wis., assignor to Faustel, Inc., Butler, Wis., a corporation of Wisconsin Filed Sept. 12, 1968, Ser. No. 759,474 Int. Cl. B6Sh 19/20 U.S. Cl. 242-56 4 Claims ABSTRACT OF THE DISCLOSURE A control system for a turnover rewind stand for effecting the transfer of a moving web material from a fully wound roll to an empty spindle includes `a signal means operatively associated with the spindle for determining when the spindle is in a predetermined position and for actuating a cutoff means for severing the web material from the fully wound ro-ll and for applying the web material to the empty spindle. The control system also includes means for matching the peripheral speed of the fully wound roll and the empty spindle to insure the transfer is completed Without tearing or looping the web.

BACKGROUND OF THE INVENTION Field of the invention The present invention relates to electrical control systems for apparatus for cutting, transferring, and winding a continuous moving web so that successive rolls of material are wound without interrupting the 'winding operation. Such apparatus is generally termed a turnover rewind stand as empty spools are brought into a web winding position by revolving or turning over portions of the stand.

Description of the prior art In the processing of web materials, as for example.. during paper converting, it is inefficient to stop the entire web processing apparatus each time an individual roll of the web material moves through the machine. For this reason, means for effecting flying splices have been developed. These devices fasten the end of the previous supply roll of web material to the forward edge of the succeeding supply roll so as to permit continuous and efficient operation of the web processing apparatus.

Similarly, means for severing the web when a given take-up or rewind roll is full and for aixing the severed end of the web to a succeeding empty spindle have also been devised.

One such rewind device, commonly referred to as a turnover rewind stand, includes a pair of rotatable spindles or spools to which the web may be affixed for rewinding purposes. These spindles are mounted in a turret, and by revolving or turning over the turret, the spindle containing the fully wound roll of web material is moved out of the rewinding position and an empty spindle is simultaneously moved into the yrewinding position. Upon a severing of the web, by a knife or other means, the end of the web is affixed to the empty spindle to continue the rewinding of the web while the fully wound roll is removed from the rewind stand.

It will be appreciated that the operation of the turret and spindle po-rtions of the rewind stand must be closely coordinated by the control `system for the stand in order to effect the transfer operation. In the past, motor driven control timers have been used to effectuate such coordination, but such timers have required precise positioning of the turret and/or spindles in order to insure correct timing. The spindle positioning required 'by the 3,529,785 Patented Sept. 22, 1970 timers was often not always desirable, for example, it was often difficult to remove the fully wound roll from the stand under these conditions.

The aforesaid timers often had an uninterruptable tiniing sequence which `required that the entire timing sequence was completed even though only a portion of the sequence was desired to alter the operation of the stand. In the event the timers got out of cycle with the mechanical portions of the rewind stand, it was often difficult, and required numerous cyclical operations, to restore proper control. Under such out of cycle conditions, the possibility of an unexpected actuation of the cut off knife was an ever present and dangerous possibility.

The timers also made it difficult to change the mode of operation of the stand, for example, from a mode wherein the printed side of the web material is o-n the inside of each wrap on the rewind roll to a mode wherein the printed side of the web is on the outside of each wrap.

SUMMARY OF THE PRESENT INVENTION It is, therefore, the object of the present invention to provide an improved control system for a turnover rewind stand.

It is a further object of the present invention to eliminate the timing devices incorporated in the presently available rewind stand control systems, thereby providing considerable flexibility Iboth in the mode of operation of the rewind stand and the positioning ofthe rewind stand spindles, as well as in the timing cycle of the control.

Yet another object of the present invention is to provide a control system for a turnover rewind stand which reduces the possibility of operator errors during the web transferring process and which insures safe operation of the stand.

The present invention provides a control system for a rewind stand for effecting the transfer of a moving web from a fully wound roll to an empty spindle. The stand includes a turret mounted thereon containing a pair of drivable spindles. The turret is revolvable on the stand to move the spindle in and out of a web rewinding position. A turnover motor is connected to the turret for revolving same, while a drive motor is provided for driving the spindle through a selectively engageable clutch means. The rewind stand also includes a cut off means for severing the web from a fully wound roll and for starting the web to the empty spindle.

The control includes a means for energizing the turnover motor to revolve the turret and move one of the spindles into the web rewinding position. Means are also provided for selectively engaging the clutch means to drive the spindle in the web rewinding position to initiate the winding process and the formation of a fully wound roll of web material on that spindle.

During the web transfer operation a means in the control is energized to reduce the speed of the spindle containing the fully wound roll while the clutch means is engaged to accelerate the empty spindle so that the peripheral speeds of the roll and the spindle are approximately equal, thereby eliminating the possibility of looping or tearing the web due to overslack or overtaut conditions.

At the same time, the means for energizing the turnover motor revolves the turret to move the loaded spindle away from the rewinding position and to move the empty spindle toward the web rewinding position. A signal means operatively associated with the turret determines when the turret is in the `web transfer position and actuates the cut-off means for severing the web and for starting the resulting new loading end of the web on the empty spindle to continue the web rewinding operation.

3 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a turnover web rewind stand of the type with which the present control system may be employed;

FIG. 2 is an elevational view of the rewind stand shown in FIG. 1;

FIG. 3 is a View similar to FIG. 2 but showing the turret and the cut-off knife in a different position; and

FIG. 4 is a schematic electrical diagram of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT The turnover web rewind stand A turnover stand made in accordance with the present invention includes a base 12 which supports the remaining portions of the stand on the work area floor. Base 12 includes a pair of spaced vertical plates 14 each having a journal 16 at the upper edge thereof for supporting a pivot shaft 18.

A turret 20 is mounted on pivot shaft 18 so that it may be revolved or turned over with respect to the stationary portions of stand 10. The turret includes a pair of arms 22, which are xedly mounted on pivot shaft 18, one adjacent each of journal 16. Each of the arms 22 includes portions extending diametrically from a center portion to which shaft 18 is axed. The opposite ends of arms 22 include slots 24 in which are journalled the spindles A and B. Arms 22 are mounted in identical angular position on pivot shaft 18 so that spindles A and B, when in slots 24, lie parallel to pivot shaft 18. A removable catch 28 at the end of arms 22 removably retains the spindles in the slots.

Pivot shaft 18 and turret 20 are revolved or turned over by turnover motor 30 mounted on one of plates 14. The output shaft of turnover motor 30 may be connected through right angle gear reducer 32 to worm gear means 34. The worm gear means 34 drives a gear 36 which is xed on one end of pivot shaft 18 to thereby revolve the shaft and turret 20. Turret 20 may be revolved in either the clockwise or counter clockwise direction, as viewed in FIG. 2, as hereinafter described.

Spindles A and B are selectively driven by a spindle drive motor 40 through clutches 42 and 44 located in the turret. Motor 40 is shown as being mounted on one of plates 14, and the output shaft of motor 40 is connected, as by gearing 46, to the driving members of clutches 42 and 44 which are of the electro-magnetic type.

The drive members of the clutches are coupled to chucks 48 and 50 into which one end of spindles A and B may be inserted for driving purposes. Motor 40 may be energized by a power supply, not shown, so as to provide constant tension or taper tension to the web as it is being rewound.

Rollers 19 may be included on turret 20 and over which the web passes so as to assist in the web transfer operation.

A cut oif knife 52 is located on rewind stand 10 or on an adjacent portion of the web processing apparatus, as shown in FIG. 1. Knife 52 includes a pair of pivotally mounted spaced supports 54 across which is mounted blade 56. Supports 54 and blade 56 are swung downwardly across the web by means of air cylinder 58 afixed to one of the supports to cut the web. As the knife severs the web, the new leading edge is also caused to be wrapped around the empty spindle. A shear bar 56a is mounted on arms 54a and swings upwardly when the knife descends so as to cooperate with the knife in effecting the shearing of the web. The position of the knife arms and shear bar arms when in the cutting position is shown in FIG. 3.

The electrical control system The electrical control system for rewind stand 10 cornprises a plurality of relays and other elements connected across a pair of power busses and 102 which provide power to the control system. The control system may be protected by fuse 104 in power bus 100.

Conductor 106 extends between power busses 100 and 102 and contains the various electrical components required to control spindle drive motor 40. A normally closed stop switch 108 is interposed in conductor 106 to stop motor 40 in the event shut-down is desired. A normally open start switch 110 is included in conductor 106 in a similar manner.

A portion of a print direction control switch 112 may also be interposed in conductor 106. Such a print control switch may be used in instances wherein rewind stand 10 is employed with web processing apparatus which prints on one side of the web. The switch permits the operator of the stand to control the rewinding of the web so that the printed material is on the inside of each wrap on the rewind roll or so that it is on the outside of each wrap. The direction of rotation of spindles A and B determine whether the printed side will be in or out. Assuming, for example, in FIG. 2, that the printed side of web 60 is the upper side of the web as it leaves the web processing apparatus, if spindle A is rotated in the clockwise direction as shown, the printed side of the web will be on the outside of each wrap. If, however, spindle A is rotated in the counter clockwise direction, the web will be taken up so that the printed side is on the inside of each wrap. The direction, clockwise or counter clockwise, that turret 20 revolves, must also be coordinated with the direction of spindle rotation. For print out operation, the turret 20 is rotated in the clockwise direction as shown in FIG. l. For print in operation, the turret is rotated in the counter clockwise direction.

To control the print direction, print direction control switch 112 includes contacts 114 in conductor 106 and contacts 116 in conductor 118 which parallels conductor 106. Contacts 114 and 116 are mutually exclusive so that when one is closed the other must be open.

A relay coil ZMF is connected in series with contacts 114 in conductor 106 while relay coil ZMR is connected in series with contacts 116 in conductor 118. Interlocking relay contacts 2MR1 and 2MF1 are included in conductors 106 and 118 respectively, while hold-in or lock up relay contacts 2MR2 and 2MF2 are included in parallel with starting switch 110.

Conductor 120 extends between power busses 100 and 102 to include normally open relay contacts 13CRL1 connected in series with normally closed relay contacts 14CR1. Relay contacts 14CR1 are operated by relay coil 14CR, hereinafter described, such that the relay contacts open instantaneously upon energization of the relay coil but close with a slight delay after de-energization of the relay coil.

A limit switch 122 is connected in series with the above mentioned components in conductor 120. This limit switch is operated by lobes 63 on cam 62 mounted on pivot shaft 18 to actuate the knife 52 when turret 20 has been turned over to a desired position. The pair of lobes 63 on cam 62 are 180 degrees apart. A second limit switch 124 is connected in conductor 127 and parallel with limit switch 122 for operation by the lobes 65 on a second cam 64 which is also fixed on the end of pivot shaft 118. Lobes 65 are 180l degrees apart. Cam 62 actuates the knife when the turret 20 is revolving in the clockwise direction. Cam 64 actuates the knife when the turret 20 is revolving in the counter clockwise direction.

An additional pair of mutually exclusive contacts i126 and 128 of print direction control switch 112 are included in conductors 120 and 127 so that depending on which printing direction is selected by switch 112, the proper one of limit switches I122 o r 124 will actuate the knife 52.

The coil 130 of the solenoid which energizes air cylinder 58 to cause knife blade 56 to descend is also included in conductor 120.

Conductor 132 extends between power busses 100 and 102 and includes limit switch :134 which is operated by knife 52 at the end of its descent and relay coil 12CR of the transfer drop out relay. The components are actuated at the termination of the web transfer operation.

Conductor 136 includes normally open relay contacts 14CR2 and normally closed relay contacts 13CRL2` connected in series. Also included in conductor 136 is relay coil coil 13CRL of the turnover position relay. The turnover position relay is of the internal latching type which, once the coil is energized by an electrical signal, retains its contacts in the energized state even though the electrical signal is removed. The relay is de-energized by a subsequent electrical signal. This subsequent electrical signal is supplied through normally open relay contacts 13CRL3 connected to conductor 132. The use of a latching relay avoids the necessity for hold-in or lock up contacts and a typical latching relay which may be used as the turnover position relay is that made and sold by the Allen-Bradley Company, Milwaukee, Wisc., under the numerical designation type N convertible contact relay, Catalog No. 700NMT200.

Conductor 138 includes normally open start transfer switch 140, closure of which initiates the transfer of the web from the full take up roll to the empty spindle, and relay coil 14CR of the transfer start relay.

Conductors 142 and 144 include the speed matching relays. One or the other of these relays is energized prior to the transfer of the web from the fully wound roll to the empty spindle. To effect the transfer, the peripheral speeds of both the roll and the spindle should be approximately the same to avoid either looping or tearing the web. Due to the larger diameter ofthe fully wound roll, its rotary speed must be less than that of an empty spindle in order to maintain the same peripheral speed. Energization of one of the speed matching relays causes slippage in the clutch driving the fully wound roll to reduce its speed, as for example, by reducing the voltage across its actuating coils. Conductor i142 contains relay coil 15CR which causes clutch 42 to slip while conductor 144 contains relay coil 16CR which causes a similar action in clutch 44. Normally closed relay contacts 17CR1 are included in series with relay coil 15CR. These relay contacts prevent energization of relay coil 15CR except when spindle A is the one containing the fully wound roll. Normally closed relay contacts 18CR1 are connected in series with relay coil 16CR to prevent energization of relay coil 16CR except when spindle B is the one containing a fully wound roll. One or the other of relay coils 15CR and 16CR is energized by the closure of normally open contacts 14CR3 in conductor 146 connected to conductors 142 and 144.

A hold-in or lock up circuit is provided for each of relay coils 15CR and 16CR. These circuits include normally open relay contacts 13CRL4 interposed in conductor 148. Relay contacts 13CRL4 are operated by relay coil 13CRL in a manner such that the contacts close instantaneously upon the energization of a relay coil but open, upon re-energization of the relay, only after a delay. Normally open hold-in relay contacts 15CR1 of relay coil 15CR are located in conductor 150 extending between conductors 142 and 148. Normally open hold-in relay contacts 16CR1 of relay coil l16CR are interposed in conductor 152 extending between conductors 144 and 148.

Conductor 154 includes a normally open spindle A start switch 156 and relay coil 17CR which engages clutch 42 to drive spindle A. An interlocking normally closed relay Contact 18CR2 is connected in series with spindle A start switch 156 to prevent operation of spindle A if spindle B is being driven. A hold-in circuit including open relay contacts 17CR2 and normally closed relay contacts 12CR1 is connected in parallel with spindle A start switch 156. An additional parallel circuit containing normally open relay contacts r15CR2 is also connected around spindle A start switch 156. Relay contacts 15CR2 are operated by the relay coil 15CR of the spindle A speed matching relay in a manner such that upon the energization of relay coil 15CR the contacts are closed only after a delay. The relay contacts are reopened immediately upon the de-energization of relay coil 15CR.

A similar circuit is provided for relay coil 18CR which engages clutch 44 to drive spindle B. Specically, conductor 158 includes spindle B start switch 160 and relay coil 18CR. An interlocking normally closed relay contact 17CR3 is connected in series with spindle B start switch 162 to prevent operation of spindle B if spindle A is being driven. A hold-in circuit including normally open relay contacts 18CR3 and normally closed relay contacts 12CR2 is connected in parallel with spindle B start switch 160. Relay contacts 16CR2, in parallel with spindle B start switch are operated by the relay coil 16CR of the spindle B speed matching relay in a manner such that upon energization of relay coil 16CR, the relay contacts are closed only after a delay. The relay contacts are reopened immediately upon de-energization of relay coil 16CR.

Relay contacts 13CRL5 operable by relay coil 13CRL are included in the control system for causing the power supply for drive motor 40 to close constant tension operation and to drive the spindle containing the fully wound roll at a speed suitable for speed matching by the empty spindle.

A DC energization circuit for coils 43 and 45 of clutches 42 and 44 is also included in the electrical control system. The input terminals of a full wave rectier bridge 162 are connected across power busses and 102 by conductors 164 and 166. The coil 43 of clutch 42 and coil 45 of clutch 44 are connected in parallel across the output terminals of the rectifier bridge by means of conductors 168 and 170.

A resistive means comprising rheostats 172 and 174 are connected in series with clutch coil 43 and normally open relay contacts 17CR. Clutch coil 43 may be energized through slip rings 176 and return slip rings 177. A normally closed set of relay contacts 16CR3 are connected in parallel around rheostats 172 and 174.

A resistive means comprising rheostats 178 and 180 are connected in series with clutch coil 45 and normally open relay contacts 18CR4. Clutch coil 45 may be energized through slip rings 82 and the return slip rings. A normally closed set of relay contacts 15CR3 are connected in parallel around rheostats 178 and 180.

A Turnover motor 30, which turns over turret 20 is actuated by the energization of one of relay coils 4MF or 4MR located in conductors 184 and 186 connected to power bus 102 by conductor `188. The direction which the turret turns over, either clockwise or counter clockwise, must fbe coordinated with the direction of rotation of the spindles, as previously noted, so as to insure that the web continues to be wound with the printed side in or out as desired. For this reason, normally open relay contacts 2MF3 are interposed in conductor 190 connected to conductor 184. A Vmanual forward switch 192 is connected in series with relay contacts 2MF3. Normally open relay contacts 2MR3 are interposed in conductor 194 connected to conductor 186 and relay coil 4MR by means of conductor 210. Both relay contacts 2MF3 and 2MR3 are connected in series with normally open relay contacts =14CR4, the former -by means of conductor 196.

The turnover stop switch 198 is connected in series with normally open relay contacts 13CRL6 in conductor 200. Conductor 200 is connected through normally open relay contacts 4MF1 and 4MR1 and conductors 184 and 186 to relay coil 4MF and 4 MR. A manual reverse switch 206 is connected in series with normally open relay conacts 2MR4 and 2MF4 and, by means of conductors 208 and 210 to relay coils 4MF and 4MR, respectively.

A knife heater switch 212 is connected in series with heating element 214 Which may be placed on knife blade 56 to assist in cutting or severing the web.

Operation of the rewind stand control system T o initiate the operation of the rewind stand, the web `60 is threaded through the web processing apparatus and the forward edge aflixed to a removable core 62 on one of the spindles, for example spindle A. As the initial rewinding operation will occur on spindle A, Spindle A start switch 156 is closed to energize relay coil i17CR, closing relay contacts 17CR2, locking up relay coil 17CR and permitting release of spindle A start switch 156. Relay contacts 17CR3 are closed, allowing clutch coil 43 to be energized from rectifier bridge 162. Relay contacts 16CR3 are closed, shorting out the rheostats 172 and 174 and allowing the full voltage of the rectier bridge to be applied to clutch coil 43. Clutch 42 is now ready to drive spindle A to rewind the web when motor 40 is energized. Relay contacts 17CR3 are open by the energization of relay coil 17CR, preventing accidental energization of relay coil 18CR which controls the operation of clutch 44 driving spindle B.

The desired print direction is selected by print direction control switch 112 so that the printed side of the web is on the inside or the outside of each wrap of the take up roll. It may be assumed, in the present instance, that it is desired to position the printed side on the outside of each wrap. Print direction control switch 112 is moved to the position shown in FIG. 4 for this purpose.

Motor 40 is energized by closing rewind start switch 110. The closure of this switch energizes relay coil 2MR because the position of print direction control switch 112. Relay coil 2MR is locked up by relay contacts 2MR2 allowing release of the rewind drive start switch 110. Relay contacts 2MR1 are opened, preventing energization of relay coil ZMF.

Motor 40 is noW energized by the power source to drive spindle A in the proper direction through clutch 42 to rewind web 60 on spindle A printed side out. As noted, supra, such rewinding may provide constant tension to Web 60.

Energization of relay coil 2MR also closes relay contacts 2MR3 and 2MR4, insuring that turnover motor 30 will turn over turret 20 in a direction which is coordinated With the printed side out web winding operation being performed on spindle A.

The turret 20 may be moved, if desired, during the winding operation by switches 192 and 206. The normal rewinding position for the turret is shown in FIG. 1.

Web 60 continues to be wound on spindle A until the rewind stand operator decides that a roll the proper size has been obtained. At this point, a transfer of the web from the full wind up roll on spindle A to the empty core 62 spindle B is initiated -by closing start transfer switch 140. Closure of the switch energizes relay coil 14CR.

Relay contacts 14CR1 are opened instantaneously, to prevent limit switch 124 from operating solenoid 130. Relay contacts 14CR2 are closed by energization of relay coil 14CR energizing relay coil y13CRL of the turnover position relay through normally closed relay contacts 13CRL2. Energization of relay coil 13CRL opens relay contacts 13CRL2 and closes relay contacts 13CRL3 deenergizing the relay coil. However, the relay contacts of the relay remain unaffected by the de-energization of relay coil 13CRL because of its construction, as noted supra.

Energization of relay coil 13CRL by the prior energization of relay coil 14CR closes relay contacts 13CRL1. The prior energization of relay coil 14CR instantaneously opens relay contacts 14CR1 so that the closure of relay contacts l13CRL1 is ineffective in causing any operation of the control system. Such an interrelatin between relay contacts 13CRL1 and' 14CR1 is needed to insure that both of limit switches 122 and 124 are open during the transfer operation. Because of an inadvertent positioning of turret 20, one of the limit switches could be closed at the start of the transfer cycle causing knife 52 to descend immediately. To prevent this, relay contacts 14CR-1 are opened immediately upon the energization of relay coil 14CR. These contacts close after a delay suicient to permit turret 20 to move to a position where neither of limit switches 122 or 124 are closed.

Energization of relay coil 14CR closes relay contacts 14CR4 to energize relay coil 4MR through closed relay contacts 2MR3. Energization of relay coil 4MR energizes turnover motor 40 to` initiate the turnover of turret 20. Relay contacts 13CRL6 are closed by the energization of relay coil |13CRL to provide a locking up path for relay coil 4MR, after start transfer switch 140 is released.

In addition to turning over the spindles, it is also necessary to match a peripheral speed of the fully Iwound roll of web material and the empty spindles as noted above. This is accomplished by reducing the rotary speed of spindle A so that the peripheral speed of the fully wound roll matches the peripheral speed of spindle B.

Closure of start transfer switch 140 closes relay contacts 13CRL5 interrupting the constant tension operation of motor 40. Motor now is in a mode so that it accelerates the core peripheral speed to match web surface speed. Relay contacts 14CR3 is also closed energizing relay coil 16CR through normally closed relay contacts 18CR1. Energization of relay coil 15CR is prevented by open contacts 17CR1 which are opened when clutch coil 43 is energized by de-energization of relay coil 17CR. Closure of relay contacts 13CRL4 and relay contacts 16CR1 hold in relay coil 16CR after start transfer switch 140 is released.

Energization of relay coil 16CR opens relay contacts 16CR3 causing a voltage drop to appear across rheostats 172 and 174- and reducing the voltage applied to clutch coil 43, causing the clutch to slip and a reduction in the rotary and peripheral speeds of the fully wound roll on spindle A.

After a slight delay, normally open relay contacts 16CR2 close, energizing relay coil 18CR, which by closing relay contacts 18CR4, energizes clutch coil 45 of clutch 44 to drive spindle B. The delay in the closure of relay contacts 16CR2 is needed to insure that relay contacts 16CR1 are closed, creating a hold-in circuit for relay coil 16CR before relay contacts 18CR1 are opened by the energization of relay coil 18CR. Relay contacts 18CR2 are also opened to prevent interference with the turnover cycle by accidental closure of spindle A start switch 156. Relay contacts 18CR3 are closed to provide a hold-in or lock up circuit for relay coil 18CR.

At this point in the operating cycle, clutch coil 43 of clutch 42 is partially energized from rectifier bridge K1'62 so as to reduce the rotary and peripheral speed of the fully wound roll on spindle A. Clutch coil 45 of clutch 44 is fully energized so as to accelerate spindle B to approximately the same peripheral speed as that of the fully lwound roll.

At the same time, the entire turret 20` is turning over as shown in FIG. 2. When the turret revolves to a position at which a cut off may be effected, limit switch 124 is tripped by lobes on cam 64 to energize solenoid and air cylinder 58 to cause cut off knife 52 to descend across the web to cut or sever it. The knife also pushes the web over spindle B to aix the web to that spindle to continue the winding operation. The outer surface of the core 62 may be covered with glue to assist in fastening the web to the core.

When cut olf knife 52 reaches the end of its travel, it trips limit switch 134 energizing relay coil 12CR of the transfer dropout relay. Energization of relay coil 12CR opens relay contacts 12CR1, de-energizing relay coil 17CR, opening relay contacts 17CR3 and de-energizing clutch coil 43 of clutch 42. This allows the fully wound roll on spindle A to coast to a 1stop after which it may be removed and another empty spindle and core placed in the turret for a subsequent rewind transfer operation.

Energization of relay coil 12CR also opens relay contacts 12CR2, but as relay contacts 16CR2 are closed, relay coil -18CR remains uneifected and in the energized state so that clutch 45 remains engaged.

The tripping of limit switch 134 also provides an unlatching signal to relay coil 13CRL through closed contacts 13CRL3 causing the relay contacts operated by that relay coil to revert to their original states. Relay contacts 13CRL1 are reopened, de-energizing solenoid 130` and causing cut oif knife 52 to revert to its initial position. This reopens limit switch 134 and de-energizes relay coil 12CR reclosing relay contacts 12CR1.

.Relay contacts 13CRL2 are reclosed and relay coil 13CRL3 is reopened to prepare relay coil 13CRL of the turnover position relay for a subsequent operation. Relay contacts 13CRL5 are reopened allowing the power supply for motor 40 to revert to constant tension operation.

The re-opening of relay contacts 13CRL4 is delayed with respect to the de-energization of relay coils 12CR and 13CRL. This insures that normally closed relay contacts 12CR2 will be reclosed before relay contacts 16CR2 are reopened by the de-energization of relay coil 16CR caused by the reopening of relay contacts 13CRL4, thereby insuring that relay coil 18CR and clutch coil 45 remain energized through relay contacts 18CR3 and 12CR2 to drive spindle B through clutch 44. Relay contacts 14CR4 and 13CRL6 are also reopened.

The turnover transfer operation from spindle A to spindle B has now been completed. The transfer of the web from the full roll subsequently wound on spindle B to an empty core on spindle A is completed in an analogous manner as is a rewinding of the web with the printed side in rather than out, as described above.

What is claimed is:

1. A control system for a web rewind stand providing wind up in both the print-in and print-out modes, said control system effecting the transfer of a moving web from a fully wound roll to an empty spindle, said stand including a revolvable turret mounted thereon for rotation in either direction, said turret having opposite ends and a driven spindle on each end for driving the roll located thereon, a turnover motor for revolving said turret in either direction, a reversible drive motor, a selectively engageable clutch means for each spindle for selectively coupling said drive motor to said spindles for driving said spindles in either direction of rotation, and a cut off means for severing said web from the fully wound roll and for starting said web on the empty spindie, said control system comprising:

rst reversing means for energizing said turnover motor to revolve said turret in a preselected direction to move one of said spindles into a web rewinding position;

second reversing means for energizing said reversible drive motor in a preselected rotary direction;

interlocking relay means coupled to said rst and second reversing means for automatically coordinating the direction of turret and spindle rotation to thereby select the mode of web wind up on the spindle;

means for selectively engaging one of said clutch means to drive its associated spindle in the preselected direction of said reversible drive motor when the spindle is in the web rewinding position to thereby wind the web thereon to form a wound roll;

means to reduce the speed of the spindle containing said wound roll and for engaging the other of said clutch means to accelerate the empty spindle upon the commencement of a web transfer operation to thereby cause the peripheral speeds of said wound roll and empty spindle to be approximately equal; said first reversing means again being operative to revolve said turret in the preselected direction to move the resulting fully wound roll away from said web rewinding position and simultaneously moving the empty spindle into the web rewinding position; and signal means operatively associated with said turret and responsive to the rotation of the turret in either direction for actuating said cut oif means to thereby sever said web at a location between said wound roll and empty spindle and to start the resulting new leading end of said web on said empty spindle.

2. A control system as set forth in claim 1 including limit switch means actuated by movement of the turret in either direction for actuating said cut otf '.rneans.

3. A control system described in claim 2 including cam means located on said turret for actuating said limit switches upon predetermined rotation of said turret.

4. A control system as set forth in claim 1 further characterized in that said means to reduce the speed of the spindle containing said wound roll comprises means for partially engaging the clutch associated with that spindle.

References Cited UNITED STATES PATENTS 2,668,023 2/ 1954 Whitson et al 242-56 2,686,015 8/1954 Stevens 242-56 2,718,362 9/ 1955 Piperoux et al 242-56 2,828,926 4/1958 Phelps 242-64XR 2,942,796 6/ 1960 Gurney et al. 242-56 2,943,806 7/ 1960 Phelps 242-56 3,266,744 8/ 1966 Volm et al. 242-56XR 3,345,009 10/ 1967 Rockstrom 242-56 3,348,107 10/1967 Hamby 242-75.51XR 3,443,769 5/ 1969 Braecker et al. 242-56 STANLEY N. GILREATH, Primary Examiner W. H. SCHROEDER, Assistant Examiner U.S. C1. XR.

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