US2601071A - Web roll accelerating apparatus - Google Patents

Web roll accelerating apparatus Download PDF

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Publication number: US2601071A
Authority: US; United States
Prior art keywords: roll; web; speed; fresh; motor
Prior art date: 1949-01-21
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired - Lifetime

Application number

US71896A

Inventor

Paul L Tollison

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Wood Newspaper Machinery Corp

Original Assignee

Wood Newspaper Machinery Corp

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1949-01-21

Filing date

1949-01-21

Publication date

1952-06-17

1949-01-21 Application filed by Wood Newspaper Machinery Corp filed Critical Wood Newspaper Machinery Corp

1949-01-21 Priority to US71896A priority Critical patent/US2601071A/en

1952-06-17 Application granted granted Critical

1952-06-17 Publication of US2601071A publication Critical patent/US2601071A/en

1969-06-17 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H19/00—Changing the web roll
- B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
- B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
- B65H19/1884—Details for effecting a positive rotation of web roll, e.g. accelerating the replacement roll
- B65H19/1889—Details for effecting a positive rotation of web roll, e.g. accelerating the replacement roll related to driving arrangements

Definitions

This roperation has been accomplished by rotatably mounting the Yfresh roll on a movablesupport, such as a web roll reel, accelerating the fresh roll'to a rotative speed or-angular velocity such-that lits surface speed or peripheral Velocity equals ⁇ the llinear velocityofthe running web, thenmoving the fresh ro-ll into Contact l withthe web runningffrom an ⁇ expiring roll to effect a splice betweenY the runningvweb ⁇ and the leading'end of the-fresh roll web, and finally severing the ⁇ old web behind the splice.
a movablesupport such as a web roll reel
the running web is mai-ntained under tension, and to this end, straps, beltsi or like flexible tension applying Ymeans are providedI to engage the surface of the roll from which ⁇ thevveb runs to the web consumingapparatus andso to retard the rotation of such roll.
straps, beltsi or like flexible tension applying Ymeans are providedI to engage the surface of the roll from which ⁇ thevveb runs to the web consumingapparatus andso to retard the rotation of such roll.
fresh -roll is either lnot-in a lposition to engage the running tensionA means at all or is notv in a position ⁇ tovengage thismeans suiiiciently to prop vide adequate tension.
New rolls are accelerated by adriving force applied through its axis.
New rolls areifrequently somewhat non-circular and for -that reason are difficult to drive from means engaging. their cylindrical surfaces. Furthermore, a roll surface engaging drive may interfere.
the invention has yfor-va further object the provision of improved means fon refA tarding the-rotation ofthe fresh rollv by a force applied ⁇ through the roll axis 4both before :the: splice is made if the running web speed fallsbe-A low the fresh roll surface speed, and afterth'e splice is made, regardless of web*speedclflanges; ⁇
the operating energy applied to the fresh roll driving motor, and, if and when necessary, a dynamic braking force applied to the fresh roll by this motor is controlled in accordance with the relation and difference between the roll speed and web speed voltages generated by the two generators.
the roll speed voltage delivered by the fresh roll driven generator for comparison with the web speed voltage is modied by the diameter of the individual fresh roll being accelerated.
variable resistance unit usually in the form of a potentiometer, that is mechanically set by the fresh roll itself to change the fresh roll speed voltage in direct proportion to changes in diameter of the particular fresh roll being accelerated.
This mechanism modifies the roll speed voltage employed for comparison with the web speed voltage to take into account the particular diameter of fresh roll being accelerated.
the fresh roll and running web speed voltages are compared by an electronic control circuit that acts to apply operating energy to the fresh roll driving motor when the roll speed voltage is lower than the web speed voltage, the magnitude of this energy varying directly with the difference between these voltages.
the control mechanism also actsl to apply dynamic braking to the roll drive motor if the web speed voltage drops more than a predetermined small amount below the roll speed voltage, thus preventing overrun of the web if the web consuming apparatus slows down during fresh roll acceleration or before the splice is made. Dynamic braking is also applied after the splice is made and during the interval while the new roll is moved to fully engage conventional running web tension means.
FIG. 1 is an end elevation of a web roll reel and associated mechanism embodying the invention and shown in the position in which a fresh web roll is accelerated to web speed in preparation for a splice;
Fig. 2 is a front elevation of the mechanism of Fig. 1;
Fig. 3 is an end elevation of the mechanism, viewed from the opposite end from that shown in Fig. 1;
Fig. 4 is a rear elevation of the fresh roll calipering part of the mechanism shown in Fig .1;
Fig. 5 is a sectional view taken along the line 5-5 of Fig. l;
Fig. 6 is an elevation of the web speed generator and a diagrammatic representation of means for driving the same from the web consuming apparatus;
Fig. 7 is a diagrammatic end elevation of a web roll reel showing the running web tensioning means, with the reel in the position at which a splice is made;
Figs. 8 and 9 are elevations similar to Fig. 7 showing the reel respectively in the position where the running web tensioning means is partly effective and in the position in Which such tensioning means is wholly effective to retard a newly-spliced-in web roll;
Fig. 10 is a diagrammatic illustration of the fresh roll driving motor and its control mechanism and circuits.
a movable web roll support in the form of a three-arm reel including spaced three-arm spiders and
the shaft I2' is journalled in bearings carried by brackets I5 and I6 secured to columns I'I and I8.
the reel may be rotated by a motor I9 connecd to the shaft I2 through a gear train 20.
Each of the spiders II and I2 carries roll supporting spindles at the ends of its arms, the spindles of the spider II being designated 2
the spindles provide rotatable supports for the web rolls. Referring to Fig.
the rolls may be designated the running roll R from which the web 28 is running to the press or other web-consuming apparatus, the fresh roll F that is about to be spliced to the running web 28, and a spare roll S that has been mounted in the reel spindles 23 and 26 to replace an exhausted roll that has been removed.
the reel is shown in a position such that the fresh roll F is in the speed-up position it occupies while being accelerated to running web speed in preparation for a splice.
the spiders II and I2 and the mechanism associated therewith may be mounted for adjustment axially of the reel shaft I2 for side register, as described in Patent No. 1,957,122.
Means are provided for applying running tension to the running web 28.
This means is here shown as a series of straps 3
are severally connected to pivoted levers 33 carry ing weight rods 34 with removable weights 35 thereon.
the fresh roll F in the speed-up and splicing positions of the reel is not retarded by the straps 3
the reel moves the newly-spliced-in roll F forward and the straps 3
the splice is executed at the proper time by known mechanism such as described in detail in Patent No. 2,148,094.
the construction and operation of such mechanism will be briefly described herein and reference may be made to the noted patent for structural and operating details.
the splicing apparatus includes web pressing brushes 36 and web cutting knives 31 pivotally supported on a frame termed the brush arm 33 that is pivotally secured at 4E) to the bracket 39 fixed to the columns I'I and I 8.
the several brushes 36 and knives 31 are disposed so as to be extended into contact with the web between adjacent pairs of the tension straps 3
a brush arm motor 4 I carried by the bracket 39, is operatively -connected to the brush arm 38 through reduction gearing and crank arms so that it lifts and lowers the brush arm under control of the operator.
the reel is turned to the speed-up position shown in Fig. 1 and the brush arm 38, which is initially in the position illustrated in Figs. 9 and 10, is lowered by operation of the motor 4I to the operativeaposition shown .in Figs.;. 1 i and i3.
The.I f mol-l E is then:aeceleratedrftoweb; speed; as; Willbe explained; andathereafter, Wherr ⁇ lthe :rune
the brush arm-38 then raised andfat thefsame..
Thelower end .of the lever forming thejmlfle.1 S carries a. roller 1 I,that jis engaged and.disengagedmyacam. .T2 .xed tothe station-4v ary banjoframe.asthespiderfi turns.. This... action of ⁇ the, cam ⁇ 12 ...engage-s and. disengages i the l.
the roll.v speedivoltage generated, by f the.v generatorA 49 is ⁇ modified ⁇ in iaccordance With :the: diameter of each fresh roll thatfisaccelerated :to splicing. ⁇
the fresh roll 1 calipering: and4 associated :mechanism employedifor.- this. purpose is shovvrrin Figs'. l,.4.';and5;
A'roll measuringlarm 'i3 is ⁇ fpivotally .supported above the spider. l2 .by c suitable means, such'asa bracketfi;v A 'rollerliil at'thefree end-fof the arm Isis-disposed. to.. be engaged. by .-the'. periphery ofa freshfwebaroll aszit moves .toward 'theaspeedeup position .(Figs.. ran-dill);
the arm.13j carries a ratcheti..
the ⁇ ratchet yl5? is. normally engagedfbya spring.. pressed fpaWl TS pivotallyI connected to. a .fixed frame?? by a shaft295.'
the pawl'lisconnected by anarm '.31to abell crank'lever 19 thexlovverv armgof-'which carriesfa. rollerl disposed inV the. ⁇ pathcf .projections 1.8i, one ⁇ of whiclr-is fiXedlon.
the spindle journalled housing 69 :of each Varm' ofthe reelspider i 2..
A .rack.83',. xede'to move with-thefarm 732i througha'rack arm lifandthepivot shaft-311:0? theyarm '13; engagesfapinionid '..carriedLby stublshaft 85 :,journalled ⁇ :in: the frame 1T' (Figs. la1id15)
the shaft 85i1 carries appinion 8Eijerr gaging. a gear 'lrlxed to the-movable: contact operating.
shaft 88 :of a :potentiometer .-83 .that .1s carried in ra -housingllfxed v.to.thefframew'il; as shown; in Figs.: 4 and 5.:
the generator is connected by suitable means, such as the sprockets 92 and 93 and a chain 94, to a shaft 95 that drives the web-consuming apparatus, in the i1- lustrated case, a printing press indicated by the printing unit PC.
the shaft 95 drives the unit PC through the bevel gears 96 and 91, the shaft 98 and the shaft of one of the impression cylinders I of the printing unit that is represented by the plate cylinders P, P and the impression cylinders II.
the roll drive motor 42 is a compound wound direct current motor having an armature A, a shunt ileld SF and a series field EF.
Energy for operating this motor is derived from an alternating current power source AC through a rectifier employing grid controlled gas filled tubes of the type known as Thyratrons, two of which are illustrated at
Thyratrons grid controlled gas filled tubes of the type known as Thyratrons, two of which are illustrated at
the rectifier power supply does not, however, permit dynamic braking of the motor by merely decreasing the potential of the supply below the potential generated by the motor when it is driven by the momentum of the rotating fresh web roll and this for the reason that a rectifier conducts electric current in one direction only.
the mechanism is arranged to connect a dynamic braking resistor I I6 across the motor armature A and series field EF to provide dynamic braking or retardation of the motor and thus retardation of the rotation of the fresh web roll when required.
the electronic control circuit compares the fresh roll speed voltage generated by the generator 49 to the running web speed Voltage generated by the generator 9
the circuit acts to supply operating energy to the roll drive motor 42 in an amount directly proportional to the difference between the roll speed voltage and the web speed voltage when the relative value of these voltages indicates that the fresh roll speed is less than the running web speed, and to apply dynamic braking to the motor when the relative value of these voltages indicates that the fresh roll speed exceeds the running web speed by more than an exceeding small percentage.
the fresh roll speed voltage employed for comparison with the running web speed voltage is modified in accordance with the diameter of the particular web roll being accelerated.
02 of the roll diameter responsive potentiom eter 89 is connected across the terminals of the roll speed generator 49, and the movable arm
the roll speed voltage employed for comparison is higher for a given angular velocity of roll rotation than With a relatively small diameter fresh roll.
the roll speed voltage employed for comparison is thus modied directly with the fresh roll diameter to indicate the peripheral velocity of each fresh roll that is to be accelerated, despite diiferences in diameter between the individual rolls.
alternating current from the source AC is supplied to the primary winding I 05 of a power transformer PT through a switch
04 is connected to operate in unison with a field control switch
the relay TR is of the delayed closing type and its contacts II2 do not close until a predetermined time interval has elapsed, following its energization. This permits the various tubes of the circuit to warm up to operating cathode temperatures before the shunt eld circuit is closed.
01 of the power transformer PT supplies energy to the circuits of the rectier tubes
This circuit is controlled by a main contactor M, the front contacts
the shunt eld SF of the motor is energized from a rectifier comprising the tubes I
variable resistor I I4 is operatively connected to and varied by the movement of the brush arm 38, and is arranged to be completely cut out of the field circuit when the brush arm is in its lowered operative position as shown in broken lines in Fig. 10, and to be completely cut in that circuit when the brush arm is in its fully raised inoperative position.
the front contacts II5 of the main contactor M shunt out the variable resistor II4 when the main contactor is closed.
the dynamic braking resistor I I9 is connected across the armature A and series eld EF of the motor 42 when the dynamic braking relay DBR is energized.
the coil II'I of the dynamic braking relay may be energized through a circuit including the back contacts- II8 of the main contactor M so that dynamic braking is applied and is controlled by the position of the brush arm 38 when the main contactor M is deenergized and so opened.
the energy for the dynamic braking relay circuit and for other control circuits has been indicated by plus and minus signs.
the brush arm drive motor 4I is energized from a source indicated at L1, L2 under the control of a raise contactor
20 When the raise contactor
J is energized, Athe motor 4
the raise and lower contactors maybe :energizediin any s known. manner, as,..for example, by .the .mechanism disclosed .in the.. aforesaid. PatentaNo. 2,148,094.
a .raise switch
29 or"..thefmain;contactor energized by .a .circuit including fthe back contact
the contactorC is ⁇ operated ⁇ @byfacam-
is controlledby an electronic ⁇ control'circuit responsive -to the difference .between ywebspeed voltage and the fresh-roll .speed voltageas modi- 'ed by the fresh roll diameter.
34 of thelpower transformer PT - is connected in a phaseshiftingbridge lcircuit thatcontrols the yphase relationfbetween the-grid potential andthe cathodepotential ⁇ ofthe Vrectifier tubes
the saturable corereactor SC carries a direct current winding
vv The described -bridge circuit acts in. a' known manner in response' :to L an increase .ingthez current rinthe winding I4 V of the satur'able core reactor toqcause the recterftubesl
the anode circuit of the tube D runs from the anode of ,that tubeto the direct current winding
the ,gridfoi the tube D is connectedfto anfintermediate point in a voltage dividing resistor vcircuit, extending between the wires
the potential applied -to the grid of .-the .tube D - is varied by a grid controlled vacuum tube V, the grid and-cathode potentials of whichvare .respectivelyvaried-in accordance with changes in running. web yspeed voltage and ⁇ fresh roll speed voltage; as will now be explained.
the anode of the tube V is connected through the wires
the cathode of this tube is connected through the wire 2i) to the-moving contact-oa ⁇ potentiometer Rl, the resistor of which uis.- connectedin series with the terminals of the running-web speed generator 9 I.
41 is included in this series circuit.
the cathode circuit of the tube V is connected to the negative return-wire
the grid circuit of the tubefV is completed through the return wire
89 ⁇ is connected between the gridand the cathode of the tube V.
the resistor ofthe potentiometer ⁇ R4 is .connected to receive current, proportional to the voltage generated by the .fresh roll speed generator 49 asmodied bythe -fresh :roll diameter responsive .potentiometere89. ⁇ To this end, the resistor of potentiometer-R4 is; connected through the resistor R9 to1the"movable;"arm
the grid of the tube V is at a lower potential with respect to its cathode than that obtaining under matched speed conditions and the tube V becomes non-conducting, thereby raising the potential on the grid of the tube D so that an increased amount of energy is supplied to the roll drive motor 42.
the described circuit thus operates to supply to the roll drive motor 42 an amount of energy directly proportional to the excess of web speed voltage over roll speed voltage as modified by fresh roll diameter.
a rectifier tube FF is supplied with alternating current by a transformer IT having primary windings
the cathode potential of the tube DD is held by the voltage regulator tubes VG and VB at a value considerably more positive than the negative return wire
60 and the setting of the potentiometer IVR are so chosen that the grid of the tube DD is biased negative with respect to its cathode to an extent that the tube is non-conductive for all values of armature current in the motor 42 below a predetermined maximum safe value.
the running web speed thus decreases to a value that is above the peripheral Velocity of the fresh roll, the result of the decrease is merely to lower the potential of the cathode of the tube V, and so lower the fresh roll speed at which matched speed conditions obtain, as described above. If the running web speed falls appreciably below the peripheral velocity of the fresh roll, due to a considerable drop in web speed during fresh roll acceleration or to an appreciable drop in webspeed after the fresh roll has reached matched speed. it is advisable to retard the rotation of the fresh roll so that no overrun of the web can result when the splice is made.
Retarding of the fresh roll under these circumstances is accomplished under control of the tube V through a tube CC, the anode circuit of which is connected to the wire
the cathode of the tube CC is connected to the wire
53 of the relay DR. are connected in a circuit including the wire
a sudden drop in running web speed to a value appreciably below the peripheral velocity of the fresh roll draws the cathode of the tube V so far negative with respect to its grid that the tube operates well above its cut-off point, drawing full anode current through the wires
the constants of the described circuits are so chosen that a decrease in running web speed to a value only slightly (i. e., about one-half of one percent) below the peripheral velocity of the fresh web roll does not alter the cathode to grid potential of the tube V sufficiently to operate this tube above the steep portion of this characteristic curve, and thus does not result in sufficient current in the anode circuit of the tube V to cause dynamic braking, as described.
the result of the drop in running web speed is merely to reduce the amount of operating energy supplied to the fresh roll drive motor 42 by drawing the potential of the grid of the tube D slightly more negative than it was at the matched speed condition.
The. operationof the disclosed' mechanism will ⁇ new -beexplained 'Some' time during the run- ⁇ ningfor ⁇ of the web from therunning rollR, the'operatoradvances the reel to place the fresh rollFi-in thespeed-up position shown inF-igs ⁇ l-- ⁇ and3.
the powerswitches'lll and lare closed-at orprior to this time'and havere- ⁇ Inainedclosed-l for asuflicient interval tovpermit heating offthe ⁇ cathodes of ⁇ the, rectiiier' tubes IGU,L12I,Y U01-and lllV to operating temperature.
VThe relayTR has accordingly closed its' contacts H2.
the main contacter-M applies'operating energy from the rectifier tubes 100 and 29 l-to the arma- ⁇ -ture and series eld circuit of the ⁇ roll -drive motor42, which then starts'and accelerates -the fresh roll.
the relay DR drops its contact ⁇ l55 ⁇ and energizes the dynamic braking relay ljR-"thus connecting the resistor across the motor armature A and series ⁇ field EF to apply dynamic braking and retard the fresh roll ⁇ speed tof a value at which its peripheral'velocity again -matches the speed of the running web.
the relay DR lifts its contact
the brush arm 38 is '-raisediby closing of the raise' switch 121,.ar-id at 14 'Ithe samev time' the reellis advancedlprogressively -througli'l'thelposition shown ini-Fig' tof-the running positionfshown in Fig.9.
Energization--of'fthe raise contacter 26 opens the energizing circuit for the main contacter-M and soldisconnects operating energyfrom themetoriarmature A and series field "EFL Deenergization- ⁇ ofy the 'main contaetor' yM- also energizestheI dynamic ybraking relay DBR- 'through the back ⁇ contacts H8 'and opensv the shunt, including the; vfront contacts 5,f around fthe ibrush arm operated' variable resistor H4. -Dynamic braking thus-applied-'to lretard.
ZJ'Web roll accelerating apparatus comprising 'the combination with webconsuming apparatus and a" web 'running thereto, of a webv roll lsupport, an electric motor connected to drivea-roll on said supportthrough its axis, arunningiweb speed generator driven from-said web 'consuming apparatus at a speed proportional to the 'speed of travel of said running web, a fresh roll'speed generator' driven from said motor at a speed proportional to-the angular Velocity of a roll on said support, means for ⁇ supplying operating energy ofV variable magnitudevto-said motor-, meansfor variably reducing the voltage generated by said ⁇ roll-speedgenerator, Ymovable means responsive to"the.diameterv of -a Afresh-web rollon said support :for Asettingfsaid'- voltage' 'reducingsmeans to reduce the roll speed generator voltage directly with and in proportion to the diameter of a fresh web roll on said support, and control means responsive to the amount by which the voltage generated by said web speed generator exceed
Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a web roll support, an electric motor having an armature and a series field connected to drive a roll on said support through its axis, a running web speed generator driven from said web consuming apparatus at a speed proportional to the speed of travel of said running web, a fresh roll speed generator driven from said motor at a speed proportional to the angular velocity of a roll on said support, means for supplying operating energy of variable magnitude to said motor, means responsive to the amount by which the voltage generated by said web speed generator exceeds the voltage generated by said roll speed generator for supplying to said motor from said energy supply means an amount of energy proportional to such excess, a resistor, and means responsive to an excess of roll speed generator voltage over web speed generator voltage for electrically connecting said resistor in series with the armature and series field of said motor to apply dynamic braking to a web roll driven by said motor.
Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a web roll support, an electric motor having an armature and a series eld connected to drive a roll on said support through its axis, a running web speed generator driven from said web consuming apparatus at a speed proportional to the speed of travel of said running web, a fresh roll speed generator driven from said motor at a speed proportional to the angular velocity of a roll on said support, means for supplying operating energy of variable magnitude to said motor, means for variably reducing the voltage generated by said roll speed generator, movable means responsive to the diameter of a fresh web roll on said support for setting said voltage reducing means to reduce the roll speed generator voltage directly with and in proportion to the diameter of a fresh roll on said support, means responsive tothe amount by which the voltage generated by said web speed generator exceeds the voltage generated by said roll speed generator as reduced by said voltage reducing means for supplying to said motor from said energy supply means an amount of energy proportional to such excess, a resistor, and means
Web roll accelerating apparatus comprising the combination with web consuming apparatus and a webl running thereto, of a movable fresh roll support, an electric motor connected to drive a roll on said support through the axis of such roll, a running web speed generator driven by said web consuming apparatus at a speed proportional to the linear velocity of said running web, a roll speed generator driven by said motor at a speed proportional to the angular velocity of a fresh roll on said support, a potentiometer connected across the output circuit of said roll speed generator, a movable arm connected to operate said potentiometer having a part thereof disposed in the path of movement of the peripheral surface of a roll on said movable support whereby said arm is moved and said potentiometer is set by movement of a fresh roll on said support to reduce the voltage generated by said roll speed generator directly with and in proportion to the diameter of such roll, and means governed by the voltages generated by said generators for supplying to said motor an amount of operating energy proportional to the amount by which the voltage generated by said web speed generator
Web roll accelerating apparatus comprising the combination With Web consuming apparatus and a web running thereto, of a fresh web roll support, an electric motor having an armature and a series field connected to drive a roll on said support, web speed responsive means driven Y by said web consuming apparatus, roll speed responsive means driven by said motor, a resistor, and means responsive to an excess of the roll speed indicated by said roll speed responsive means over the web speed indicated by said web speed responsive means for connecting said resistor in series with the armature and series field of said motor.
Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a fresh web roll support, an electric motor having an armature and a series field connected to drive a roll on said support, Web speed responsive means driven by said web consuming apparatus, roll speed responsive means driven by said motor, means responsive to an excess of the web speed indicated by said web speed responsive means over the roll speed indicated by said roll speed responsive means for supplying operating energy to said motor, a resistor, and means responsive to an excess of the roll speed indicated by said roll speed responsive means over the web speed indicated by said Web speed responsive means for connecting said resistor in series with the armature l and series eld of said motor.
Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a fresh web roll support, an electric motor connected to drive a roll on said support through the roll axis, a
Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a web roll reel rotatable to move a fresh web roll to a position in which it is accelerated in preparation for splicing its web to the running web, an electric motor connected to drive a roll on said reel through the roll axis, a running web speed generator driven by said web consuming apparatus at a speed proportional to the linear velocity of the running Web, a roll speed generator driven by said motor at a speed proportional to the angular velocity of the motor driven roll, means for variably reducing the voltage generated by said roll speed generator, means for setting said voltage reducing means to reduce the roll speed generator voltage in direct proportion to the diameter of a fresh roll comprising an arm connected to said Voltage reducing means and disposed in the path of roll movement by said reel to the roll accelerating position, and means responsive to an excess of web speed generator voltage over roll speed generator voltage as reduced by said voltage reducing means for supplying to said motor an amount of operating energy proportional to such excess.
Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a fresh web roll support, a direct current motor having an armature, a series field and a shunt field, connected to drive a roll on said support, a brush arm for effecting a splice between the running web and the web of a roll on said support and movable between an operative position and an inoperative position, means for initiating movement of said brush arm from its operative position toward its inoperative position, means for connecting a source of operating energy to the armature and serieseld of said motor, a shunt field energizing circuit, a variable resistor selectively connectible in said shunt field energizing circuit, a dynamic braking resistor, means responsive to operation of said brush arm movement initiating means for disconnecting said source of operating energy from said motor armature and said series field and connecting said dynamic braking resistor thereto and simultaneously connecting said variable resistor in said shunt eld energizing circuit, and
Web roll accelerating apparatus comprising the combination with Web consuming apparatus and a Web running thereto, of a fresh web 18 roll support, a direct current motor having an armature, a series iield and a shunt field, connected to drive a roll on said support, a web speed generator driven by said web consuming apparatus, a roll speed generator driven by said motor, a brush arm for eecting a splice between the running web and the web of a roll on said support and movable between an operative position and an inoperative position, means for initiating movement of said brush arm from its operative position toward its inoperative position, means for connecting a source of operating energy to the armature and series field of said motor, a shunt eld energizing circuit, a variable resistor selectively connectible in said shunt eld energizing circuit, a dynamic braking resistor, means responsive to an excess of roll speed generator voltage over web speed generator voltage for connecting said dynamic braking resistor to said motor armature and series eld

Landscapes

Replacement Of Web Rolls (AREA)

Description

June 17, 1952 P. L. ToLLlsoN WEB Rom. ACCELERATING APPARATUS 6 Sheets-Sheet 1 Filed Jan. 2l, 1949 June 17, 1952 P. l.. 'roLLlsoN WEB ROLL ACCELERATING APPARATUS 6 Sheets-Sheet 2 Filed Jan. 2l, 1949 INVENTOR PAUL LQ TOLL/50N BY 79M,

ATTORNEYS June 17, 1952 P. l.. ToLLlsoN WEB ROLL ACCELERATING APPARATUS 6 Sheets-Sheet 3 Filed Jan. 21, a1949 INVENTOR 'PAUL L. TOLL/50N o BY muy sMfkmLr/ ATTORN EYS June 17, 1952 P. 1 ToLLlsoN 2,601,071

WEB ROLL ACCELERATING APPARATUS Filed Jan. 21, 1949 6 Sheets-Sheet 4 INVENToR PAUL L. TOLLISON June 17, 1952 P. L. To| |soN WEB ROLL ACCELERATING APPARATUS 6 Sheets-Sheet 5 Filed Jan. 21, 1949 INVENTOR PAUL L TLL A50/V v BY mi ATTORNEYS June 17, 1952 P. rOLLISON WEB ROLL ACCELERATING APPARATUS 6 Sheets-Sheet 6 Filed Jan. 21, 1949 ...n wunv ATTORNEYS Patented June 17, 1952 UNITED STATES PATENT OFFICE WEB ROLL ACCELERATING APPARATUS Paul. L. Tollison, North PlainelcLN. J., assignor to,Wood YNewspaper Machinery Corporation, Plainfield, N. J., a corporation, of Virginia Application January "Z1, 1949, Serial Nio71,896

webscto web consuming apparatus, it is necessary or desirable that a flexible web running from a roll be replaced bya web from afresh roll while the Web is running at full operating speed tothe web consumingrapparatus. Thus, in the supply of paper web to printing presses, it is customary to employpaper'web rolls and to splice the web from a-fresh roll to the `web .running from a depleted roll without .stoppingormaterially retarding the rate of travel of the running web. This roperation has been accomplished by rotatably mounting the Yfresh roll on a movablesupport, such as a web roll reel, accelerating the fresh roll'to a rotative speed or-angular velocity such-that lits surface speed or peripheral Velocity equals `the llinear velocityofthe running web, thenmoving the fresh ro-ll into Contact l withthe web runningffrom an `expiring roll to effect a splice betweenY the runningvweb `and the leading'end of the-fresh roll web, and finally severing the` old web behind the splice. The running web is mai-ntained under tension, and to this end, straps, beltsi or like flexible tension applying Ymeans are providedI to engage the surface of the roll from which `thevveb runs to the web consumingapparatus andso to retard the rotation of such roll. Duringgfresh roll acceleration,` at they time the spliceis made'and for an interval thereafter, the

fresh -roll is either lnot-in a lposition to engage the running tensionA means at all or is notv in a position` tovengage thismeans suiiiciently to prop vide adequate tension.- No tensionis applied from the conventional tension means to the fresh roll While-itis acce1erating,=,andif the speed of the web consuming .apparatus falls at this time, the new roll web may be moving faster than the runningy webwhenvthe splice is made, which causes an undesirable overrun of the web. It is accordingly desirable to provide means other than the conventional running web tension means to retard -thelfresh roll rotation until the fresh` roll has been spliced and has thereafter moved to a position where it engages the running web tension means suiciently to be adequately retarded by such engagement.

It is `preferable that the new roll be accelerated by adriving force applied through its axis.Y New rollsareifrequently somewhat non-circular and for -that reason are difficult to drive from means engaging. their cylindrical surfaces. Furthermore, a roll surface engaging drive may interfere.

with the adhesive or othersplice-formingmaterial carried at the leading edge of the new .roll

web. On theother hand, axial drive off-thenew roll involves `regulating the rotative speed orl an,- gular velocityrto whichv the roll is acceleratedinaccordance with the diameter `of'- the @articulan roll in use, since a given vperipheral velocitylis; attained by lower angular velocity inlarge diameter rolls than in smallones.A In` .practice,-web1 rolls vary in diameter to such anextent that there`v rotative speed to which theyare acceleratedmustf be variedfrom rollito rollito provide aperipheral` velocity that is satisfactoryt foreffecting the: splice toa web running at a Vpredetermined:speedyA When itis considered that the running -web speed also varies, and that for satisfactory-splicingthev linear speedsof the runningweb and gfresh'vrollweb must be. substantially identical, it will bey` appreciated that the problem of acceleratinggthe new roll to splicing speedthroughaXiaLdrive'is a difficult one.

With the foregoingconsiderations in mindfit' is an object of the present invention to provide -f improved means involving axial drive for Yrapidly bringingva fresh web roll-up to splicingsp'eed in running web. The invention has yfor-va further object the provision of improved means fon refA tarding the-rotation ofthe fresh rollv by a force applied` through the roll axis 4both before :the: splice is made if the running web speed fallsbe-A low the fresh roll surface speed, and afterth'e splice is made, regardless of web*speedclflanges;`

so as to avoid web overrunning at the time of the splice and to maintain tension on the running web during the interval after the splice when the new roll is being moved to a position in which: a retarding tension producing force is applied a to its surface by conventional running web tension means.-

The above and other objects of the invention; are carried out by employing an electric motor 5 to drive each fresh roll and accelerate it to speed through itsl axis and vby employing improved mechanism for governing the speed to Awhichthe rollffis accelerated 'by the motor.

This is doneY .by providing twogenerators, preferably of thetype known as tachometer generators, one of which is driven from or at a speed bearing a fixed relation to the speed of the fresh roll, and the other of which is driven from or at a speed bearing a fixed relation to the speed of the running web or web consuming apparatus. The operating energy applied to the fresh roll driving motor, and, if and when necessary, a dynamic braking force applied to the fresh roll by this motor, is controlled in accordance with the relation and difference between the roll speed and web speed voltages generated by the two generators. According to the invention, the roll speed voltage delivered by the fresh roll driven generator for comparison with the web speed voltage is modied by the diameter of the individual fresh roll being accelerated. This is preferably accomplished by means of a variable resistance unit, usually in the form of a potentiometer, that is mechanically set by the fresh roll itself to change the fresh roll speed voltage in direct proportion to changes in diameter of the particular fresh roll being accelerated. This mechanism modifies the roll speed voltage employed for comparison with the web speed voltage to take into account the particular diameter of fresh roll being accelerated.

The fresh roll and running web speed voltages are compared by an electronic control circuit that acts to apply operating energy to the fresh roll driving motor when the roll speed voltage is lower than the web speed voltage, the magnitude of this energy varying directly with the difference between these voltages. The control mechanism also actsl to apply dynamic braking to the roll drive motor if the web speed voltage drops more than a predetermined small amount below the roll speed voltage, thus preventing overrun of the web if the web consuming apparatus slows down during fresh roll acceleration or before the splice is made. Dynamic braking is also applied after the splice is made and during the interval while the new roll is moved to fully engage conventional running web tension means.

In describing the invention in detail, reference will be made to the accompanying drawings in which an embodiment thereof has been illustrated.

In the drawings- Fig. 1 is an end elevation of a web roll reel and associated mechanism embodying the invention and shown in the position in which a fresh web roll is accelerated to web speed in preparation for a splice;

Fig. 2 is a front elevation of the mechanism of Fig. 1;

Fig. 3 is an end elevation of the mechanism, viewed from the opposite end from that shown in Fig. 1;

Fig. 4 is a rear elevation of the fresh roll calipering part of the mechanism shown in Fig .1;

Fig. 5 is a sectional view taken along the line 5-5 of Fig. l;

Fig. 6 is an elevation of the web speed generator and a diagrammatic representation of means for driving the same from the web consuming apparatus;

Fig. 7 is a diagrammatic end elevation of a web roll reel showing the running web tensioning means, with the reel in the position at which a splice is made;

Figs. 8 and 9 are elevations similar to Fig. 7 showing the reel respectively in the position where the running web tensioning means is partly effective and in the position in Which such tensioning means is wholly effective to retard a newly-spliced-in web roll; and

Fig. 10 is a diagrammatic illustration of the fresh roll driving motor and its control mechanism and circuits.

In Figs. 1, 2 and 3 there is shown a movable web roll support in the form of a three-arm reel including spaced three-arm spiders and |2 carried on and fixed against rotation relative to a central reel shaft I 2. The shaft I2' is journalled in bearings carried by brackets I5 and I6 secured to columns I'I and I8. The reel may be rotated by a motor I9 connecd to the shaft I2 through a gear train 20. Each of the spiders II and I2 carries roll supporting spindles at the ends of its arms, the spindles of the spider II being designated 2|, 22 and 2'3 and those of the spider I2 being designated 24, 25 and 26. The spindles provide rotatable supports for the web rolls. Referring to Fig. 1, the rolls may be designated the running roll R from which the web 28 is running to the press or other web-consuming apparatus, the fresh roll F that is about to be spliced to the running web 28, and a spare roll S that has been mounted in the

reel spindles

23 and 26 to replace an exhausted roll that has been removed. In Fig. 1, the reel is shown in a position such that the fresh roll F is in the speed-up position it occupies while being accelerated to running web speed in preparation for a splice. The spiders II and I2 and the mechanism associated therewith may be mounted for adjustment axially of the reel shaft I2 for side register, as described in Patent No. 1,957,122.

Means are provided for applying running tension to the running web 28. This means is here shown as a series of straps 3|, one end of each of which is secured to a bracket 32 fixed to the foundation. The other ends of the straps 3| are severally connected to pivoted levers 33 carry ing weight rods 34 with removable weights 35 thereon. As is apparent from Figs. 1 and 7, the fresh roll F in the speed-up and splicing positions of the reel is not retarded by the straps 3|. After the splice is made, the reel moves the newly-spliced-in roll F forward and the straps 3| engage increasing arcs of its surface, as shown in Fig. 8, until full running tension is applied by the straps 3| at the running position of the reel shown in Fig. 9.

The splice is executed at the proper time by known mechanism such as described in detail in Patent No. 2,148,094. The construction and operation of such mechanism will be briefly described herein and reference may be made to the noted patent for structural and operating details. The splicing apparatus includes web pressing brushes 36 and web cutting knives 31 pivotally supported on a frame termed the brush arm 33 that is pivotally secured at 4E) to the bracket 39 fixed to the columns I'I and I 8. As shown in Fig. 2, the several brushes 36 and knives 31 are disposed so as to be extended into contact with the web between adjacent pairs of the tension straps 3|. A brush arm motor 4 I, carried by the bracket 39, is operatively -connected to the brush arm 38 through reduction gearing and crank arms so that it lifts and lowers the brush arm under control of the operator. When the running roll R has run olf to the point where the operator considers a roll replacement will soon be necessary, the reel is turned to the speed-up position shown in Fig. 1 and the brush arm 38, which is initially in the position illustrated in Figs. 9 and 10, is lowered by operation of the motor 4I to the operativeaposition shown .in Figs.;. 1 i and i3. The.I f mol-l E is then:aeceleratedrftoweb; speed; as; Willbe explained; andathereafter, Wherr `lthe :rune

ning rollRzhassrum off: tothe point where).aispliee;V mustfbe. made, the .-'bnush'esf are extendedfto press..theirunning@Webi=28ifagainstthe fresh roll; surface,-. the.--V pastencamyingy leading s end.A of. the` freslfr.y roll` iweb engages fandv'sticks to. .therunning` webandv ith'e 1knives 3l iareextendedto sever the oldrWebvbehind-the spl'c'e,=.as .isillustratedsinFig;.7F The brush arm-38 then raised andfat thefsame.. time the :ireel is turned-f-Lforward; that r is, in the; direction-of fthe-arrow. .inf 1, to.:progressively move the newly-spliced-in roll F' to itsarunningf position-,as :illustratedin Figs. Siand- 9.?. It'wvill'be understoodth'at known .mechanismnis employed tof effectand lcontrol the 4described i coordinated. movements of tliefz-brushfarm,- the-brushes, the. knives and the-reel. Suitable mechanism of .this

nature-is" shown-1in: Pater-1t 'No; 2 ,148 5094,; referred: 'P

tov-above.t The-freshf roll"V accelerating..y and Preetarding 'mechanisnr of the present invention is preferably =.coordinatedf@Withethe @splicing-K opera-- tionfby contacts controlled-.by the-position of `the: brush-farmI 38; as will be described.

An eleetric'emotor-42 'is providedffor- `accelerat` ing@ each successive fresh-Webhroll toerunningc web speed "and forretardi'ngthe rotati'orr'of such roll, as will be explainedv The motor-152isshovvnfA mountedfoneabracketi lfixed"to`-a-cross beam 44-'- (Figs- 2 wand# 3) It is-conneeted-y to drive a cross "shaft LEM-through suitable means; suchas thesprocketsf Mfand thechain-d3;-` A roll*l speedtachometer generator 49 A'is' Amounted on-the bracket 43 and is directly-connectedtothe motor 42 by-a' suitable means; such-,as the sprockets 53 and 5 l' and-the chain* 52, so that this-l generator y rotates -at ai'speed and accordingly' generates -a= Vol'tage bearing? a fixed `relation-:to the angular velocity-or-rotative speedat whichthe fresh roll turns Rol-l driving power istransmitted'to {each-'freshl rolf Ain turnbyfmechanisnr -nowfto bodescribedr The shaft"451is connected 'bybevel' gearsy V53 to ae vertical shaft' '54|4 journalled-infthe banjo iframe 55;A The g'b'anjo 'frame 55 `is stationary;- andethe'V reel spider 1| 2 includingthe vspindle clutchr housings 55j; turnsV withY the Areef shaft Ai2 relative thereto;- Roll drivingpower vfrom-the shaftl 5ft-" is .transmittedthroughthe rbevel gears-5i and` ga" stub shaf,t"58^to a; pinion '59." Theitainicvne)'eneV gages'a gearxed toa largegeary 6I concentrc.,therewith' and rotatably journal'led on-"the hubiof the spider l2: The-large geari engagesI three spindle driveigears 62mountedrespectively on the shaftslof the three spindles 2i; 22 'an-d 23,3 Each of Athegears 62 iis operativelyvconnected -tol its spindle shaft by a clutchincludingatoothedi element 'V64 'fixed to thegearfand acomplee mentary movable toothed element 65-splined jto but slidable valongg-the .spindleshaftrl A'pivotally mounted yoke 'jengages a circumferential slot' in the movable clutch el-ementand is normallybiased toa `clutch engaging positionpy a spring T0 'connected between anarm 61 ongthe yoke vpivot shaft 68 and the spindle journal housing E9 V(Figs. 2.and 3). Thelower end .of the lever forming thejmlfle.1 Scarries a. roller 1 I,that jis engaged and.disengagedmyacam. .T2 .xed tothe station-4v ary banjoframe.asthespiderfi turns.. This... action of `the, cam` 12 ...engage-s and. disengages i the l.

clutch; .elementi 65 I.from 'the clutch .element Asshovvnin.Fig.2;sthe.camfi2 hasa gap thereinw extendingfonabout1100?- to: reel rotation; start-i Y ingfat afpoint 'just` before eachl spider armreaches f its. @upper ver-tical, position Vand f, continuing: f to. 1a.. point just above the.-.horizontal position ofxthe spider arm adjacenttherunningweb: Withzthis.

. arrangement,4 the fclutchff elements .613 .i and` :55 of each spindle areengagedzito operatively connectthespindle and thustheweb roll carried `thereby 1 to the roll driving .motor ,42,v as .thespindle apiproaches the roll' speedu-p.` position Ain `whichthe.

, spindle `25 :isxshown in Fig; 3;. The clutch ele-.-4

ments are disengaged; when thev spindle appreaches the running.:position. .illustrated .bylthe roll .FinsFig .9.. Thespindle drive andiclutchmechanism hereiny described .is disclosed inmoreV i detail in Patent No. 2,148,094;

In. accordance. with-the present invention the roll.v speedivoltage generated, by f the.v generatorA 49 is` modified `in iaccordance With :the: diameter of each fresh roll thatfisaccelerated :to splicing.`

The fresh roll 1 calipering: and4 associated :mechanism employedifor.- this. purpose is shovvrrin Figs'. l,.4.';and5; A'roll measuringlarm 'i3 is `fpivotally .supported above the spider. l2 .by c suitable means, such'asa bracketfi;v A 'rollerliil at'thefree end-fof the arm Isis-disposed. to.. be engaged. by .-the'. periphery ofa freshfwebaroll aszit moves .toward 'theaspeedeup position .(Figs.. ran-dill); The arm.13jcarries a ratcheti.. The `ratchet yl5? is. normally engagedfbya spring.. pressed fpaWl TS pivotallyI connected to. a .fixed frame?? by a shaft295.' The pawl'lisconnected by anarm '.31to abell crank'lever 19, thexlovverv armgof-'which carriesfa. rollerl disposed inV the.` pathcf .projections 1.8i, one` of whiclr-is fiXedlon. the spindle journalled :housing 69 :of each Varm' ofthe reelspider i 2.. A'spring v821biases the pawly lef. andszits operating: mechanism toward the ratchetf engaging@ position.:

A=.rack.83',. xede'to move with-thefarm 732i througha'rack arm lifandthepivot shaft-311:0? theyarm '13; engagesfapinionid '..carriedLby stublshaft 85 :,journalled` :in: the frame 1T' (Figs. la1id15) The shaft 85i1carries appinion 8Eijerr gaging. a gear 'lrlxed to the-movable: contact operating. shaft 88 =:of a :potentiometer .-83 .that .1s carried in ra -housingllfxed v.to.thefframew'il; as shown; in Figs.: 4 and 5.: The.A potentiometer Vis electrically l connectedgfto the Youtput;circuit of the roll speed voltagefgenerator 49; as Wil'lbexde-Jv scribed.;

With the describedarrangement, as geachrarrn.v of-f the )spider i2- approaches yits upper'. verticali position and the iwebt roll'- carried by-fthe.v spindle f on; such varm is adisposedgbeneath.:the roller: 15'? .onizthe measuringwarmen; the vproj ection -8 lv er1-- gages f the roller r 33and.;lifts ntheflower.- arm. of the .-bellicranklever .19,fathus .disengagingthe pawl E' Gafrom the ,ratchet `I5 'f `anclzpermitting the arm 'Sto descend "until itiis arrestedibynengagement: oirits; roller V'l 5 twithfthe surface fofjthelfweburollp As. the reel advances, the peripheralsurface of the 1 webrollfliftsthefarm J3 .to-atpositiorrfcorresponde inglto Vthe-.diameteriof thai-oli, andfeth'e farm, is heidrin .this position-byengagementfof thepawl 'igfgwitliathe .ratohet T554.V The movement. of .the-

:istransmitted-to the sh'aftzeof fthe potentiemeer f8 il yandethe .potentiometer i is :.:thus set tesa.f position ,correspending;V to-xthe diameter. @of thefffresh-.roll ;that-:is:beingmoved;to-.;the -roll speede-,upiposition Tr uri-ning webpspeed v1voltage-senerator 9 lg is-drivenefrom the-zwebfconsuminggapparatus at= a. speedgbearingg; aw xed relations to. thexspeed of the running;` fvveb, wherebytheevoltag@ gene crates-.5;i varies f directly.; within: the-1 runrinsiz, webs speed. As illustrated in Fig. 6, the generator is connected by suitable means, such as the sprockets 92 and 93 and a chain 94, to a shaft 95 that drives the web-consuming apparatus, in the i1- lustrated case, a printing press indicated by the printing unit PC. As is illustrated in Fig. 6, the shaft 95 drives the unit PC through the bevel gears 96 and 91, the shaft 98 and the shaft of one of the impression cylinders I of the printing unit that is represented by the plate cylinders P, P and the impression cylinders II. These cylinders directly engage the running web 28 and accordingly the speed at which the generator 9| is driven bears a direct relation to the linear speed of the running web.

The apparatus for applying and controlling the operating energy for the fresh roll driving motor 42 and the dynamic braking of this motor to retard fresh roll rotation will now be described. This apparatus is illustrated in Fig. 10.

The roll drive motor 42 is a compound wound direct current motor having an armature A, a shunt ileld SF and a series field EF. Energy for operating this motor is derived from an alternating current power source AC through a rectifier employing grid controlled gas filled tubes of the type known as Thyratrons, two of which are illustrated at |00 and 20|. By employing rectifier tubes of this type and an electronic control circuit which governs the firing of these tubes, the amount of energy supplied to the motor 42 may be very rapidly varied and accuratelyr controlled. The rectifier power supply does not, however, permit dynamic braking of the motor by merely decreasing the potential of the supply below the potential generated by the motor when it is driven by the momentum of the rotating fresh web roll and this for the reason that a rectifier conducts electric current in one direction only. For this reason, the mechanism is arranged to connect a dynamic braking resistor I I6 across the motor armature A and series field EF to provide dynamic braking or retardation of the motor and thus retardation of the rotation of the fresh web roll when required. In general, the electronic control circuit compares the fresh roll speed voltage generated by the generator 49 to the running web speed Voltage generated by the generator 9| and supplies operating energy or applies dynamic braking to the roll drive motor 42 in accordance with the relation and relative magnitude of these Voltages. More specifically, the circuit acts to supply operating energy to the roll drive motor 42 in an amount directly proportional to the difference between the roll speed voltage and the web speed voltage when the relative value of these voltages indicates that the fresh roll speed is less than the running web speed, and to apply dynamic braking to the motor when the relative value of these voltages indicates that the fresh roll speed exceeds the running web speed by more than an exceeding small percentage.

As has been explained, the fresh roll speed voltage employed for comparison with the running web speed voltage is modified in accordance with the diameter of the particular web roll being accelerated. As shown in Fig. 10, the resistor |02 of the roll diameter responsive potentiom eter 89 is connected across the terminals of the roll speed generator 49, and the movable arm |03 of this potentiometer, which is moved by the shaft 88 as has been explained, is raised to increase the proportion of the generated voltage delivered to the output circuit in comparison with the web speed voltage as the fresh roll diameter increases and is lowered to decrease the proportion of such voltage so delivered as the diameter of the fresh roll decreases. Thus, with a relatively large diameter fresh roll, the roll speed voltage employed for comparison is higher for a given angular velocity of roll rotation than With a relatively small diameter fresh roll. The roll speed voltage employed for comparison is thus modied directly with the fresh roll diameter to indicate the peripheral velocity of each fresh roll that is to be accelerated, despite diiferences in diameter between the individual rolls.

Referring to Fig. 10, alternating current from the source AC is supplied to the primary winding I 05 of a power transformer PT through a switch |04. The switch |04 is connected to operate in unison with a field control switch |06 which supplies direct current from a source DC to a time delay relay TR, the contacts II2 of which are connected in the shunt eld current supply circuit, as will be described. The relay TR is of the delayed closing type and its contacts II2 do not close until a predetermined time interval has elapsed, following its energization. This permits the various tubes of the circuit to warm up to operating cathode temperatures before the shunt eld circuit is closed.

The secondary winding |01 of the power transformer PT supplies energy to the circuits of the rectier tubes |00 and 20| and these anode circuits include in their common cathode return circuit |08 the series field EF and the armature A of the roll drive motor 42. This circuit is controlled by a main contactor M, the front contacts |09 of which are included in the common cathode return circuit, as shown. The shunt eld SF of the motor is energized from a rectifier comprising the tubes I|0 and I|I, energized from the power transformer secondary winding |01 through a circuit including the contacts II2 of the relay TR., the coil II3 of a field loss relay FLR and a variable resistor II4. The variable resistor I I4 is operatively connected to and varied by the movement of the brush arm 38, and is arranged to be completely cut out of the field circuit when the brush arm is in its lowered operative position as shown in broken lines in Fig. 10, and to be completely cut in that circuit when the brush arm is in its fully raised inoperative position. The front contacts II5 of the main contactor M shunt out the variable resistor II4 when the main contactor is closed. The dynamic braking resistor I I9 is connected across the armature A and series eld EF of the motor 42 when the dynamic braking relay DBR is energized. The coil II'I of the dynamic braking relay may be energized through a circuit including the back contacts- II8 of the main contactor M so that dynamic braking is applied and is controlled by the position of the brush arm 38 when the main contactor M is deenergized and so opened. To simplify the drawing, the energy for the dynamic braking relay circuit and for other control circuits has been indicated by plus and minus signs.

The brush arm drive motor 4I is energized from a source indicated at L1, L2 under the control of a raise contactor |29 and a lower contactor I2I. When the raise contactor |20 is energized, the motor 4I is energized to operate in a direction that raises the brush arm 38 through a circuit including the front contact |22 of the raise contactor, the back contact |23 of. the. lower contactor .I2 Luand .the :motor eld .|24. When the lower contactor l2 |J is energized, Athe motor 4| is energized `to operateinasfdirection `to lower .thebrush .armii through.;a circuiti including the `front contact` |25. of .the lower contactor, the .back contact; 2 2 foi '..Lthe .raise contactor, `and .the motor. eld. |26. The raise and lower contactors maybe :energizediin any s known. manner, as,..for example, by .the .mechanism disclosed .in the.. aforesaid. PatentaNo. 2,148,094. To simplify Athe present .disclosure, thereis shown a .raise switch, |21. for. .energizing the.. raisecontactor |20. anda lower.A switchfl28 `for. energizing the .lowercontactor |21, the -circuits controlled by these switches beingapparent f l from the drawing.

all brush arm positions except-its fully raised -inl operative position. rIhus, the main COntactOr-flVI .isv energized to supply .Operatingenergy tothe roll drive motor 42when the brusharm; 38 is moved down from its inoperative Vposition and isthereafter vnormally maintainedvenergized untilthe brush arm is fully raised'after avspliceis made and the newly spliced rollfis. advanced by the reel to running position.

In the eventthat the shunt neldSFoi thelmotor 42 is deenerg-ized forany reason, as, -ior example, byrfailure ofone or bothpfthe. rectifier tubes lill and |,the iield loss 'relay-winding H3 is deenergized and the contacts |'3| of-this relay open, thereby breaking the main contactor energizing circuit; disconnecting theyroll drive,motor 42 from its source of operating energyand-ap plying dynamic braking to thisxmotor.

.The amount of operating energy supplied to the roll drivemotor 42 by thev rectii-ler tubes Ille and 20| is controlledby an electronic `control'circuit responsive -to the difference .between ywebspeed voltage and the fresh-roll .speed voltageas modi- 'ed by the fresh roll diameter. `A centertapped secondary winding |34 of thelpower transformer PT -is connected in a phaseshiftingbridge lcircuit thatcontrols the yphase relationfbetween the-grid potential andthe cathodepotential` ofthe Vrectifier tubes |00 and 20| and so governs the ring and the average current supplied `by `these tubes. One leg of this-bridge circuit .runs -from fthecenter -tap .of the secondary winding |34 through-the primary-winding |35 of ar gridtransformer GT andto. the common wire |36. 'I-hesecondary windings ofthe grid transformer GTv are respectively .connected in thev gridcircuits of-vthe tubes 4HJ() l and 20L. as shown. AH second leg ofthe bridge circuit runsl .from one end offthetransformer secondary .winding 34 through .a resistor |'3|..to.the. common Wire |36. `The .third'leg of the bridge circuit runs .fromthe opposite endof the transformer secondary winding |34 through the wire` |38 in parallel 'through the twoal-ternating current windings |'39and' |40 of the saturable core reactor-SC'to the common lwire |36.

The saturable corereactor SC carries a direct current winding |4|-connected inthe` anode circuitof a grid controlledfvacuum'tube D. `vvThe described -bridge circuit acts in. a' known manner in response' :to L an increase .ingthez current rinthe winding I4 V of the satur'able core reactor toqcause the recterftubesl |l;.20 I. .to ure-or .conduct current earlier in thecycle ofv thealternating current. .impressed on -their anode circuits and .thus .to .pass .alarger average. anode current. and soincrease theoperating energy suppliedto the. arma- .ture A-A and series ield'EFof the roll drivexmotor 42. '.Aidecrease/in current through .thewinding =|4 of Lthesaturable `core reactorsimilarly causes `a smalleraverage currentto. be supplied..to...the lmotorili. by the rectifier .tubes il?) and 20| "Thus, the amount. of. operating energy supplied to .the roll.v drive..motor .is varieddirectly .with .changes .in theanode current of thetube D.

.Energy .for operating. .the tubeD and .theother control tubes. to. bedescribed is .derived fromthe rectifierincludingthegtubes and |||.,through the wire. |142. LJByymeansof theseries connected voltage regula-tor tubesVGandVB; the Wire 1.42 yisheld at a steady positive potential .with respect .tothe negativeor return wire |43. that leads to the .center .tap .of the transformer secondary .winding |01; from which-the rectifier tubes H0 and lllV are energized. -A wire |44 is connected betweenA the `two voltage regulator tubes VG and VB and so.is;held;ata positive potential approximately. half lthat maintained on the wire |42.

The anode circuit of the tube D runs from the anode of ,that tubeto the direct current winding |4| of. the saturable-core reactor SC to the wire |42, and from the cathode of the tube D to the .wire |44. The ,gridfoi the tube D is connectedfto anfintermediate point in a voltage dividing resistor vcircuit, extending between the wires |42 and |43 andincluding the resistors R2,R3, R.|| andR5. The potential applied -to the grid of .-the .tube D -is varied by a grid controlled vacuum tube V, the grid and-cathode potentials of whichvare .respectivelyvaried-in accordance with changes in running. web yspeed voltage and `fresh roll speed voltage; as will now be explained.

VThe anode of the tube V is connected through the wires |45 and A|453 to apoint between the resistorsMR2 and R3. The cathode of this tube is connected through the wire 2i) to the-moving contact-oa `potentiometer Rl, the resistor of which uis.- connectedin series with the terminals of the running-web speed generator 9 I. A variable resistor-|41 is included in this series circuit. The cathode circuit of the tube V is connected to the negative return-wire |43 through a variable resistor R6, which. provides adjustable negative gridf-bias for the -tube V. The grid circuit of the tubefV is completed through the return wire |43; alresistor RID, the resistor and the movable contactof apotentiometer R4 and the wire |48. Aggrid-condenser |89 `is connected between the gridand the cathode of the tube V. The resistor ofthe potentiometer`R4 is .connected to receive current, proportional to the voltage generated by the .fresh roll speed generator 49 asmodied bythe -fresh :roll diameter responsive .potentiometere89. `To this end, the resistor of potentiometer-R4 is; connected through the resistor R9 to1the"movable;"arm |63 of the potentiometer 89, .andthe. resistor of the potentiometer A8S Yis connected .'in. series with the vfresh. roll speed generatorfdlxfthrough the wires |49, leef-15| and. 43.

'.iTheV tubeHVis .ofxthe sharp cut-ofi vtype and the; constants; of.; the" described circuits Aof Vthis tube-fare: so chosen` vthat-when the peripheral velocity: .of the -fresh roll, as determined by .the terminaliV voltageof theygenerator-dg modified Icy-fthe:V roll diameter: responsiveV potentiometer 8,9,'-matches-the running web speed as determined by the generator 9|, the grid of the tube V will be biased negative with respect to its cathode to an extent that the tube will operate on the steep portion of its characteristic curve, and will pass just enough anode circuit current to fix the bias of the grid of the tube D at a point where the anode current of that tube will cause the power rectifier tubes and 20| to supply just sufficient energy to the roll drive motor 42 to drive the fresh roll at'the matched speed against the friction and windage load thereon. When the fresh roll speed is below the matched speed condition described, the grid of the tube V is at a lower potential with respect to its cathode than that obtaining under matched speed conditions and the tube V becomes non-conducting, thereby raising the potential on the grid of the tube D so that an increased amount of energy is supplied to the roll drive motor 42. The described circuit thus operates to supply to the roll drive motor 42 an amount of energy directly proportional to the excess of web speed voltage over roll speed voltage as modified by fresh roll diameter. With this arrangement, each fresh roll is accelerated to an angular velocity or rotative speed such that its peripheral velocity is equal to that of the running web, and is held at such speed until the splice is made.

When the fresh roll is at a standstill or is turning slowly, its inertia imposes a heavy load on the motor 42, and means are provided to limit the current drawn by this motor under such conditions and so to protect the motor and the rectifier tubes |00 and 20| against damage or failure due to overload. A rectifier tube FF is supplied with alternating current by a transformer IT having primary windings |56 and |51 connected, respectively, in the anode circuits of power supply rectifier tubes |00 and 20|. The

secondary Winding |58 of the transformer IT has a center tap connected to the negative return wire |43 through the resistor |59. The cathode of the rectifier tube FF is connected through the resistor of a potentiometer IVR and the xed resistor |00 to the negative return wire |43. With this arrangement, a direct current voltage proportional to the armature current of the motor 42 is produced across the resistor of the potentiometer IVR. A predetermined part of this potential is impressed on the control grid of a current limit tube DD, the anode of which is connected to the wire |45 and the cathode of which is connected to the wire |44. The cathode potential of the tube DD is held by the voltage regulator tubes VG and VB at a value considerably more positive than the negative return wire |43.' The value of the fixed resistor |60 and the setting of the potentiometer IVR are so chosen that the grid of the tube DD is biased negative with respect to its cathode to an extent that the tube is non-conductive for all values of armature current in the motor 42 below a predetermined maximum safe value. If the motor armature current exceeds the safe maximum value, the potential on the grid of the tube DD rises to and past the cut-off point, and the tube DD, which has a sharp cut-off, becomes conductive, drawing current through the resistor R2 and so drawing the grid of the tube D negative and phasing back the firing point of the rectifier tubes |00 and 20|, thus reducing the armature current supplied by these tubes to the motor armature circuit to a safe value. It sometimes happens that the speed of the press or other web consuming apparatus drops while a fresh 12 roll is being accelerated or after the roll has been brought to web speed but before the splice is made. This, of course, results in a drop in running web speed. If the running web speed thus decreases to a value that is above the peripheral Velocity of the fresh roll, the result of the decrease is merely to lower the potential of the cathode of the tube V, and so lower the fresh roll speed at which matched speed conditions obtain, as described above. If the running web speed falls appreciably below the peripheral velocity of the fresh roll, due to a considerable drop in web speed during fresh roll acceleration or to an appreciable drop in webspeed after the fresh roll has reached matched speed. it is advisable to retard the rotation of the fresh roll so that no overrun of the web can result when the splice is made. Retarding of the fresh roll under these circumstances is accomplished under control of the tube V through a tube CC, the anode circuit of which is connected to the wire |42 through the winding |52 of a relay DR. The cathode of the tube CC is connected to the wire |44 and its grid is connected between the series connected resistors R3 and R| The back contacts |53 of the relay DR. are connected in a circuit including the wire |54 that energizes the dynamic braking relay DBR and so connects the dynamic braking resistor ||6 across the armature A and series field EF of the motor 42 when the movable contact |55 of the relay DR drops. A sudden drop in running web speed to a value appreciably below the peripheral velocity of the fresh roll draws the cathode of the tube V so far negative with respect to its grid that the tube operates well above its cut-off point, drawing full anode current through the wires |45 and |46 and thus drawing the grid of the tube CC so far negative that the relay DR drops its movable contact |55, thus applying dynamic braking to the roll drive motor. As soon as the speed of the fresh roll drops to a value such that its peripheral velocity substantially equals that of the running web, the cathode to grid potential of the tube V is reduced to the point where the anode circuit current of this tube drops, thus permitting the grid of the tube CC to become more positive, with the result that the winding |52 of the relay DR receives sufficient energy to lift the movable contact |55, thus deenergizing the dynamic braking relay DBR and discontinuing dynamic braking of the fresh roll.

The constants of the described circuits are so chosen that a decrease in running web speed to a value only slightly (i. e., about one-half of one percent) below the peripheral velocity of the fresh web roll does not alter the cathode to grid potential of the tube V sufficiently to operate this tube above the steep portion of this characteristic curve, and thus does not result in sufficient current in the anode circuit of the tube V to cause dynamic braking, as described. In such a case, the result of the drop in running web speed is merely to reduce the amount of operating energy supplied to the fresh roll drive motor 42 by drawing the potential of the grid of the tube D slightly more negative than it was at the matched speed condition. As the operating energy for the motor 42 is thus slightly reduced, the friction load on the motor, the fresh roll and the driving connection therebetween, is sufficient to promptly reduce the roll speed to a value that matches the web speed, and the 13 .-'cathode :potential `of the tube i V is thereby? so reduced relative to its gridpotential thatenergy lstiflicient l to maintaink the fresh roll at the matched, speedV is supplied to the roll drive "motor:42.

. The. operationof the disclosed' mechanismwill `new -beexplained 'Some' time during the run- `ningfor `of the web from therunning rollR, the'operatoradvances the reel to place the fresh rollFi-in thespeed-up position shown inF-igs `l--`and3. The powerswitches'lll and lare closed-at orprior to this time'and havere- `Inainedclosed-l for asuflicient interval tovpermit heating offthe` cathodes of `the, rectiiier' tubes IGU,L12I,Y U01-and lllV to operating temperature. VThe relayTR has accordingly closed its' contacts H2. A'As' the fresh roll Fmoves to the vspeed--up position, the roll size potentiometer: 88 is set Aby '-thelfresh rolLF, as hasbeen'explained, to a position in Which-vit modies the voltage genertated by the roll speed generator'lg so as' to pro duce-at the grid of the 'tubeV a voltage correirspend-ing to the peripheral velocity oflthe particular` ffresh roll. Also during-advancing of the roll l to -speed-upposition; the clutch llgo thefr-esh roll spindle 22 is engaged byfmovement fofthe roller 'H off thecam 72,*and in-'thislmannerlthe motorW-"QZ andthe roll-speed 'generator "49" are operatively connected `toV the fresh roll'F.

f-"When'from the* size of the depleted-running -ro'll -R'lthef operator judgesv that a` roll replacement is necessary, he lowers the brush arm `33 f-to itsf-vertical operating-positionfas shown in Figs.1,` 3 and 7, by closing' the lower switch 4728. i'llhe initial vdownward movementv'of thel brush armv from its raised 'inoperative position-closes the -contactor C. This'energizes-andV closes the main-contacter M through a Acircuit including thecontacts |32 of the contacter C, the-contacts l3l of the field loss relay FLR- and the back contactl3-of the raise contacter-126. -Closureof the main contacter-M applies'operating energy from the rectifier tubes 100 and 29 l-to the arma- `-ture and series eld circuit of the `roll -drive motor42, which then starts'and accelerates -the fresh roll. TheV amount vof energy supplied to the motor =42 is reduced in proportion to the reduction of the Vamount by which the running 'Web-speed Voltage ofthe-generator 9| exceeds the roll speed Voltage of the generator 4! as modified by the roll size potentiometer'yand "whenthese voltages are'matched, which occurs when the peripheral velocity of the fresh roll matches the linear velocity of the running web 28, Vthe'amount of operating energy supplied to the motor 42 is just enough to maintain roll rotation at the matched speed.

`If during acceleration or prior to splicing, the `presser other web consuming apparatus slows 4down enough to bring VVthe web speed more than `about-one percent below the peripheral Velocity `ofthe Yfresh roll, the relay DR drops its contact `l55^and energizes the dynamic braking relay ljR-"thus connecting the resistor across the motor armature A and series `field EF to apply dynamic braking and retard the fresh roll `speed tof a value at which its peripheral'velocity again -matches the speed of the running web. When the fresh roll has thus been retarded to matched speed; the relay DR lifts its contact |55, deenergizes'the dynamic braking relay DBR and so dis- #connects' the'resistor H6 from the motorarmat'ure circuit.

After the spliceis made, the brush arm 38 is '-raisediby closing of the raise' switch 121,.ar-id at 14 'Ithe samev time' the reellis advancedlprogressively -througli'l'thelposition shown ini-Fig' tof-the running positionfshown in Fig.9. The raisefswit'ch maybe-closed andf the reeladvanced byautomatic mechanism -initiated byv =the-`operation` of theknives T37 'atlthef conclusion ofthe splicing operation, as ``is"diselosed`in` lPatent No; 2,148,094. 'To simplifythepresent disclosure such automatic mechanism-isnot shown. Energization--of'fthe raise contacter 26 opens the energizing circuit for the main contacter-M and soldisconnects operating energyfrom themetoriarmature A and series field "EFL Deenergization-` ofy the 'main contaetor' yM- also energizestheI dynamic ybraking relay DBR- 'through the back `contacts H8 'and opensv the shunt, including the; vfront contacts 5,f around fthe ibrush arm operated' variable resistor H4. -Dynamic braking thus-applied-'to lretard. the newly-'spliced-in rolliinmediately after the' splice is made and before the' -rollY -is-mloved into contact with'the tension straps3l. "As-the newroll'F- moves progressively -into greater peripheral ycontacty with the straps' 3 l the value -of the variable resistor H4 is increased "by-upward -movement `of the brush' arm38, thus yreducing the shunteld current andftheldynamic braking 4retardation ofthe neWly-sp'liced-in roll. When the" brush-'arm'lS-S yreaches itsully raised inoperative position, ythe contactor'C 'isropened bythe `cam R33 `and th'is maintains `the maincontactor M A` deenergi'zedy despite the -factthatthe? raise lcontacter liis then deener'giZed-due to opening 'of the raise switchv 12T-by 'the operator. Atfthe running -positionofthe* reel,-the` clutch of -the i' fresh rollspindle is'`disengaged"byf movement of the -roller 'i lontothe cam' '12.

1.-"Web Aroll Aaccelerating apparatus comprising the'vcombination-with web consuming-apparatus and' aiweo `running thereto; of; aweb rollsupp'oit, an-electricmotor connectedwtodrive a; rlllon said ysupport lthrough its axis; a -runningwebspeed generator `driven frornsaidweb consuming- 'apsaid' roll speed generator directly with #and "iin proportion' to the initial diameter "of afresh* rll on said support, and meansfrespon'sive-to the relation'between the voltage generated by saidweb speed 'generator and 'theov'oltage -geneltediby said roll speed generator as reduced" by said-voltage reducingmeans for governing the amount-fof energy supplied to'saidA motor.

ZJ'Web roll accelerating apparatus comprising 'the combination with webconsuming apparatus and a" web 'running thereto, of a webv roll lsupport, an electric motor connected to drivea-roll on said supportthrough its axis, arunningiweb speed generator driven from-said web 'consuming apparatus at a speed proportional to the 'speed of travel of said running web, a fresh roll'speed generator' driven from said motor at a speed proportional to-the angular Velocity of a roll on said support, means for `supplying operating energy ofV variable magnitudevto-said motor-, meansfor variably reducing the voltage generated by said `roll-speedgenerator, Ymovable means responsive to"the.diameterv of -a Afresh-web rollon said support :for Asettingfsaid'- voltage' 'reducingsmeans to reduce the roll speed generator voltage directly with and in proportion to the diameter of a fresh web roll on said support, and control means responsive to the amount by which the voltage generated by said web speed generator exceeds the voltage generated by said roll speed generator as reduced by said voltage reducing means for supplying to said moto;` from said energy supply means an amount of energy proportional to such excess.

3. Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a web roll support, an electric motor having an armature and a series field connected to drive a roll on said support through its axis, a running web speed generator driven from said web consuming apparatus at a speed proportional to the speed of travel of said running web, a fresh roll speed generator driven from said motor at a speed proportional to the angular velocity of a roll on said support, means for supplying operating energy of variable magnitude to said motor, means responsive to the amount by which the voltage generated by said web speed generator exceeds the voltage generated by said roll speed generator for supplying to said motor from said energy supply means an amount of energy proportional to such excess, a resistor, and means responsive to an excess of roll speed generator voltage over web speed generator voltage for electrically connecting said resistor in series with the armature and series field of said motor to apply dynamic braking to a web roll driven by said motor.

4. Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a web roll support, an electric motor having an armature and a series eld connected to drive a roll on said support through its axis, a running web speed generator driven from said web consuming apparatus at a speed proportional to the speed of travel of said running web, a fresh roll speed generator driven from said motor at a speed proportional to the angular velocity of a roll on said support, means for supplying operating energy of variable magnitude to said motor, means for variably reducing the voltage generated by said roll speed generator, movable means responsive to the diameter of a fresh web roll on said support for setting said voltage reducing means to reduce the roll speed generator voltage directly with and in proportion to the diameter of a fresh roll on said support, means responsive tothe amount by which the voltage generated by said web speed generator exceeds the voltage generated by said roll speed generator as reduced by said voltage reducing means for supplying to said motor from said energy supply means an amount of energy proportional to such excess, a resistor, and means responsive to an excess of roll speed generator voltage over web speed generator voltage for electrically connecting said resistor in series with the armature and series eld of said motor to apply dynamic braking to a roll driven by said motor.

5. Web roll accelerating apparatus comprising the combination with web consuming apparatus and a webl running thereto, of a movable fresh roll support, an electric motor connected to drive a roll on said support through the axis of such roll, a running web speed generator driven by said web consuming apparatus at a speed proportional to the linear velocity of said running web, a roll speed generator driven by said motor at a speed proportional to the angular velocity of a fresh roll on said support, a potentiometer connected across the output circuit of said roll speed generator, a movable arm connected to operate said potentiometer having a part thereof disposed in the path of movement of the peripheral surface of a roll on said movable support whereby said arm is moved and said potentiometer is set by movement of a fresh roll on said support to reduce the voltage generated by said roll speed generator directly with and in proportion to the diameter of such roll, and means governed by the voltages generated by said generators for supplying to said motor an amount of operating energy proportional to the amount by which the voltage generated by said web speed generator exceeds the voltage generated by said roll speed generator as reduced by said potentiometer.

6. Web roll accelerating apparatus comprising the combination With Web consuming apparatus and a web running thereto, of a fresh web roll support, an electric motor having an armature and a series field connected to drive a roll on said support, web speed responsive means driven Y by said web consuming apparatus, roll speed responsive means driven by said motor, a resistor, and means responsive to an excess of the roll speed indicated by said roll speed responsive means over the web speed indicated by said web speed responsive means for connecting said resistor in series with the armature and series field of said motor.

'7. Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a fresh web roll support, an electric motor having an armature and a series field connected to drive a roll on said support, Web speed responsive means driven by said web consuming apparatus, roll speed responsive means driven by said motor, means responsive to an excess of the web speed indicated by said web speed responsive means over the roll speed indicated by said roll speed responsive means for supplying operating energy to said motor, a resistor, and means responsive to an excess of the roll speed indicated by said roll speed responsive means over the web speed indicated by said Web speed responsive means for connecting said resistor in series with the armature l and series eld of said motor.

8. Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a fresh web roll support, an electric motor connected to drive a roll on said support through the roll axis, a

web speed responsive generator driven by said web consuming apparatus, a roll speed responsive generator driven by said motor, means for variably reducing the voltage generated by said roll speed generator, means responsive to an excess of web speed generator voltage over roll speed generator votage as reduced by said voltage reducing means for supplying to said motor an amount of operating energy proportional to such excess,

' and roll calipering mechanism responsive to the diameter of a roll on said support for setting said variable voltage reducing means to reduce the rool speed generator voltage in direct proportion to the diameter of the roll.

9. Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a web roll reel rotatable to move a fresh web roll to a position in which it is accelerated in preparation for splicing its web to the running web, an electric motor connected to drive a roll on said reel through the roll axis, a running web speed generator driven by said web consuming apparatus at a speed proportional to the linear velocity of the running Web, a roll speed generator driven by said motor at a speed proportional to the angular velocity of the motor driven roll, means for variably reducing the voltage generated by said roll speed generator, means for setting said voltage reducing means to reduce the roll speed generator voltage in direct proportion to the diameter of a fresh roll comprising an arm connected to said Voltage reducing means and disposed in the path of roll movement by said reel to the roll accelerating position, and means responsive to an excess of web speed generator voltage over roll speed generator voltage as reduced by said voltage reducing means for supplying to said motor an amount of operating energy proportional to such excess.

l0. Web roll accelerating apparatus comprising the combination with web consuming apparatus and a web running thereto, of a fresh web roll support, a direct current motor having an armature, a series field and a shunt field, connected to drive a roll on said support, a brush arm for effecting a splice between the running web and the web of a roll on said support and movable between an operative position and an inoperative position, means for initiating movement of said brush arm from its operative position toward its inoperative position, means for connecting a source of operating energy to the armature and serieseld of said motor, a shunt field energizing circuit, a variable resistor selectively connectible in said shunt field energizing circuit, a dynamic braking resistor, means responsive to operation of said brush arm movement initiating means for disconnecting said source of operating energy from said motor armature and said series field and connecting said dynamic braking resistor thereto and simultaneously connecting said variable resistor in said shunt eld energizing circuit, and means for progressively reducing the value of said variable resistor as said brush arm moves from its operative to its inoperative position.

11. Web roll accelerating apparatus comprising the combination with Web consuming apparatus and a Web running thereto, of a fresh web 18 roll support, a direct current motor having an armature, a series iield and a shunt field, connected to drive a roll on said support, a web speed generator driven by said web consuming apparatus, a roll speed generator driven by said motor, a brush arm for eecting a splice between the running web and the web of a roll on said support and movable between an operative position and an inoperative position, means for initiating movement of said brush arm from its operative position toward its inoperative position, means for connecting a source of operating energy to the armature and series field of said motor, a shunt eld energizing circuit, a variable resistor selectively connectible in said shunt eld energizing circuit, a dynamic braking resistor, means responsive to an excess of roll speed generator voltage over web speed generator voltage for connecting said dynamic braking resistor to said motor armature and series eld, means responsive to operation of said brush arm movement initiating means for disconnecting said source of operating energy from said motor armature and series eld, connecting said dynamic braking resistor thereto and connecting said variable resistor in said shunt field energizing circuit, and means for progressively reducing the value of said variable resistor as said brush arm moves from its operative to its inoperative position.

PAUL L. TOLLISON.

REFERENCES CETED The following references are of record in the le of this patent:

UNITED VSTATES PATENTS Number Name Date 1,973,363 Wood Sept. 11, 1934 2,018,842 Durham Oct. '29, 1935 2,029,045 Wood Jan. 28, 1936 2,039,471 Wood May 5, 1936 2,148,094 Wood Feb. 21, 1939 2,237,985 Garman Apr. 8, 1941 2,298,877 Edwards et al Oct. 13, 1942 FOREIGN PATENTS Number Country Date 413,278 Great Britain July 10, 1934

US71896A 1949-01-21 1949-01-21 Web roll accelerating apparatus Expired - Lifetime US2601071A (en)

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US71896A US2601071A (en)	1949-01-21	1949-01-21	Web roll accelerating apparatus

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US71896A US2601071A (en)	1949-01-21	1949-01-21	Web roll accelerating apparatus

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US71896A Expired - Lifetime US2601071A (en)	1949-01-21	1949-01-21	Web roll accelerating apparatus

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Cited By (4)

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US2963234A (en) *	1955-04-21	1960-12-06	Miehle Goss Dexter Inc	Web splicing apparatus
US3298623A (en) *	1963-04-10	1967-01-17	Fuller Electric Ltd	Rollstand equipment for unwinding and rewinding web material
WO1994019267A1 (en) *	1993-02-16	1994-09-01	Bengt Andreasson	Roll stand for feeding paper web from a roll
US5697575A (en) *	1995-04-28	1997-12-16	Enkel Corp	Vertical splicer

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US2148094A (en) *	1933-08-22	1939-02-21	Wood Newspaper Mach Corp	Web splicing device
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US2018842A (en) *	1931-10-21	1935-10-29	Goss Printing Press Co Ltd	Web renewing mechanism
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US2963234A (en) *	1955-04-21	1960-12-06	Miehle Goss Dexter Inc	Web splicing apparatus
US3298623A (en) *	1963-04-10	1967-01-17	Fuller Electric Ltd	Rollstand equipment for unwinding and rewinding web material
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US5697575A (en) *	1995-04-28	1997-12-16	Enkel Corp	Vertical splicer

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SE8603724D0 (en)	1986-09-05	CONTINUOUSLY RUNNING REWINDER WITH PRESSURE ROLLER
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US1908490A (en)	1933-05-09	Means for supplying webs

US2601071A - Web roll accelerating apparatus - Google Patents

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Citations (8)

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Cited By (4)

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