US2654545A - Web-renewing mechanism - Google Patents

Description

Oct. 6, 1953 T. R. BENNETT 2,654,545v

' WEB-RNEWING MEcHANIsM Filed March 13, 1950 3 Sheets-Sheet l Oct. 6, 1953 T. R. BENNETT 2,654,545

WEB-RENEWING MECHANISM Filed March 15, 195o s sheetsQsheet 2 Oct. 6, 1,953

T. R. BENNETT 2,654,545 WEB-RENEWING MECHANISM Filed March l5, 1950 3 SheetsFSheet 3 Patented Oct. 6, 1953 WEB-RENEWNG MECHANSM Thomas Richard' Bennett, Kingsbury, London,

England, assigner to R. Hoe` & Co. Inc., Newv York, N..Y., ai corporation of New York Application March 13, lesdseriaiNo. 149,244 In Great Britain March 14, 1949 3 Claims.. (Cl. 242-58) This invention relates to Web-renewing'mecha-Y nism for use in the supply of Webs to Webdcon-v suming machines such as printing, wrapping and' box making machines. The inventionI isv concerned withv that type of such mechanism wherein provision is made to enable the web-supply'to be maintained without stopping the machine by arranging a replacement. web-roll to be brought up to the speedof the Webl running to the machine and by causing the running Weband the rotating. replacement roll toy engage and adhere to one. another so that ther web ofthe replacement rollv commences to be drawn from the roll at which time the running (and now expiring) we'b is severed. i

In this type. of mechanism it is. common to employ what are frequently termed. three-arm roll stands having three roll' positions, one for a running roll from which the. web is. drawn,. a second for a replacement roll the. web of which is joined as. described to the Web passing from. the runing roll, and the third for a freshly loaded roll, the various rolls successively beingbrought into replacementv and running positions,

It is common in this.l type ofmechanisin to effect control of the. tension of the web passing.. from the running roll to provide at each` rolll position a brake device tov operate on the. core of the various rolls, the various brake devices being. rendered active only as the associated. roll moves into replacement andrunning position.

Now the present invention is. concerned with. such an arrangement. and. it has. for itsiobjectfto` provide a combinationofpartsfWhichwill provide athree arm roll sta-nd arrangement which. shallv be capable of'v ready control.

According to the presentr invention there is,

provided in combination with such. a three arm-v roll stand, a frame to carry a driven belt; thev frame being movable to apply the beltvv to and tov move it from the peripheral surface of. a rol-l inn' they replacementposition of they roll stand Where 'by that roll may be. speeded up. from. rest to a1 peripheral surface speed equal. or approximating; to. the speed at which the web; is beingdrawn from the running roll. In addition the combinaa tion of parts includes; anv assemblyy comprisingv supports. carrying a brush and a. severing. knife. the former to deflect. the'. running Web. so as to contact the periphery of the replacement roll'. and to adhere toit through an adhesive-- (such asia rubberl'atex): which has been'. pre-applied tov the end3 of' the Web.- ofl the replacement roll andl the. latter to. sever theweb passing from. the runs ning roll just. after the two webs have adhered'.

with the movement to one another. The invention includes alsomechanism whereby the brush and' knife supports' are moved automatically into and'v out of their operating position in synchronism Withcorre-i sponding movements of the belt frame. Prefer= ably this synchronous operation is' effectedC 'by a singleelectric motor. With such an organisation of parts, the replacement roll can be'speeded up? and the brush and knife set in readiness toeffect the joint between the two Webs and to sever the running web (which at this time also the expiring' web) by the mere closingv of the circuit' of the single motor. This can be arranged' forV control by an operator Who observes the reduction in; diameter of the running roll as'it becomes, spent or it can be arranged for automatic control by a device which respondsv to the. diameter ofthe running` roll.. Similarly, the actual operation of the brush and the knife which are synchronised of the belt frame into opera.- tive position can be determined'. by an. operator but here again this operation could be rendered'. automatically in response to the reductionv in the diameter of ther running roll or bya time contrnll which is setto be effective after the. lapse of a predeterrnined.v time interval following the. move,-

mentl of the belt frame to operative. (i. e. speedling-iip) position.

i The invention may also provide meanswhereby' the operation of'the Web-severing device automatically causes. the. reverse operation` of. the. motor.

The invention isv illustrated' inv the accompanying drawings in which Figurel is a side-elevation Figure 2i a plan View and Figure 3. a pictorial. wiring diagram..

Referring to the drawings, I indicates a. roll support which is mounted to rotate in a roll. stand la. The supporthas. three. roll positions; 2, 3,l 4A which (in the position shown inthe-draw.-v ing). correspond to. a loadingv positionin Whichf a. fresh roll isplaced'. in position on the support., a. replacement position inwhichv a.. fresheroljl is speededup and itsweb-joinedto the running; web: W'passingv froml an expiring roll in the. positionl.V The support is arrangedL to be' moved anguiarly to carry its differentj roll positions` successively through. the operating positions. referred. to, ,and this isV effected by an. electric motor 5 operatingv through gearing 6.

Disposed above the roll' in the renewing posi.- tion 3 isa deviceto speed-up thev roll from rest. tothe speed at which therunning web W'is being drawn on by the Web-consuming machine; This device comprises4 frames 1- having pulleysvv 8; 9v

about which are trained belts I0. The pulleys 8 are fast on a shaft II which is driven from the web-consuming machine and the frames 'i are arranged to be rocked about the shaft I I to bring the belts I into and out of contact with the roll in replacement position 3 as shown in Fig- 'ure 1.

Disposed at the side of the expiring web W from the roll in position 4 is a web-renewing mechanism: this mechanism comprises a brush frame I2, a knife frame I3 and a guide frame i4. The frames comprise side arms joined by stretchers I8 and I9 for the frames I2, I3 and by a stretcher 23 for the frame I4, this latter stretcher forming a guide for the web. The three frames are mounted to swing about or with stub shafts 2|. The assembly is normally raised to the position shown in dotted lines in Figure 1 and in full lines in Figure 2. The knife frame I3 and the guide frame I4 are connected through the stub shafts 2i to rock together and the brush frame I2 is arranged to be latched by latches 22V to the knife frame I3 so as to move with it and, when the latch is released, to be capable of moving relatively to the knife frame I3. The knife frame is provided with a sheath 23 in which a knife is normally contained. When a web-renewing operation is to be effected, the assembly is swung to the position shown in Figure l in which position the knife sheath 23 and the guide 20 cause the expiring web W to take a fixed path to which the replacement roll in position 3 is ad justed by the motor so as to bring the periphery of the replacement roll to a predetermined distance from the expiring web.

Y At the appropriate time, the speed-up belts It! are lowered to engage and speed up the replacement roll to which adhesive has Ibeen applied. Then, also at an appropriate time the latches 22 are operated to free the brush frame l2 for swinging movement to press the expiring web W against the periphery of the now rotating replacement roll in position 3, and the expiring web is joined by the adhesive to the outer end of the web of the replacement roll and both webs pass on together. The knife in the sheath 23 is immediately projected from the sheath and the web W is thus severed, leaving the web from thereplacement roll alone to be drawn forward.

The tension of the web drawn on by the machine is arranged for regulation by brakes 25 which operate on the plugs which support the rolls by the core; such a brake is provided` for each roll position 2, 3, 4 of the support I and as shown, each brake comprises a brake band which is operated by a lever 26 itself under the control of a screw 21 coupled to an electric motor 28. The various motors are arranged to be connected in circuit with a tension control device by a commutator arrangement which places the motors under control while the roll positions are in and anywhere between the replacement and expiring positions 3 and 4. comprises a spring loaded roller 29 which is free to move with change'in the tension of the web and to cause its movement to operate through a link 30 on a switch mechanism in a control box 3|. The brakes can be set by hand-wheels 32 to have a degree of braking independent of the control exercised by the motors 28.

The foregoing mechanism and its general operation is in itself well known and it is therefore believed to be unnecessary to give further details. rihe present invention is concerned with an arrangement by which the movement of the belt The tension control device frames I1 and the movement of the brush, knife and guide frames I2, I3, I4 can be synchronized and effected by a single electric motor.

To effect this, the belt frames 'I which are mounted to swing about the shaft II, are extended by arms 33 having followers 34 to engage eccentrics 35 on a shaft 36. The shaft is provided with a worm wheel 31 engaged by a worm 38 on a spindledriven by a reversible electric motor 40. Energization of the motor in one sense causes the eccentrics 35 to move away from the followers 34 so that the belt frames 1 can swing by gravity to carry their belts I0 down into engagement with the surface of a roll in the replacement position 3. The degree of movement of the eccentrics is such that the belts engage the roll before the eccentrics complete their movement so that the ec centrics leave the followers 34 so permitting the belts to accommodate themselves to the roll. When the motor 4l] is reversed, the eccentrics 35 move back into engagement with the followers and so rock the frames E to carry the belts away from the roll.

So that the belts IIJ shall be stationary except when they are actually required for use, the movement of the frames 1 is utilized to connect and disconnect the pulleys 9 to and from the drive. This is effected by connecting the shaft I I to the machine drive (as indicated a gear wheel 4!) through a clutch `42. The clutch ismoved in and out by a lever 43 which is operated by a cam 44 on the shaft 3B. When this shaft 35 is operated by the motor 40 to lower the belts I the cam 4-4 allows the clutch to move in to transmit drive from the machine to the shaft II and hence to the belts I0 and vice versa.

Now, for the purpose of using the same motor 40 to raise and lower the frame assembly I2, I3, I4, the shaft 36 is fitted with crank pins 45 mounted to the worm wheel 31 at the one end of the shaft 36 and the other fitted on a disc 46 at the other end of the shaft. These two crank pins are connected each to one end of a rod 41 the other end of which is slidable in a guide block 48 on an extension 49 of the side arm I2 of the brush frame. Movement of the rods 41 in a direction corresponding to the raising of the assembly is limited by a stop 50 whichl engages the guide block 48; each rod is fitted with a spring 5I which is interposed between the block 48 andl an abutment 52 on the rod.

When the shaft 36 is turned by the motorli to lower the belts I, the crank-pins 45 at the same time move the rods 41 to the right as seen in Figure 1; this allows the frames I2, I3, I4 to lower by gravity from the out-of-use position shown in dotted lines in Figure 1 to the position of readiness shown in full lines. This position of readi ness is determined by fixed stops 53 which engage the side arms I3 of the knife frame. This engagement occurs before the motor 4@ has completed its operation so that during the remainder of its operation the rods 41 are slid through the guide blocks 48 and during this time the springs 5I are loaded so that the brush frame I2 is spring pressed against the releasable latches 22. When the latches are released, the brush frame I2 is freed to be swung forward by the springs 5| to deect the web to make a joint between the expiring web W and the Web of the roll which was speededup by the belts ID.

Not only do the springs 5I constitute the actuating means for the brush frame, but they also avoid any possibility of damage to the brush and knife frame assembly should they be inadvertently in their operative position when the roll` 5.1. stand' I. is turned. In such.v an occurrence the springs I allow the frames to be, so to: speak, pushed clear by an` oncoming roll. The arrangement however enables the rods` 4,1#when operated, to raise the brush and: knife frames positively through the stops 5I) on the rods.

In orderto enable the belt arrangement to be adaptedV to handle web. rolls. of diiferentv lengths, the belt-frames. can beslidableaxially (i. e. in a. direction parallel with the. roll axis)` on. its shaft- I I.

As is known in thisv type of. mechanism, the actual timesat which the brush frame I2 is freed to deflect the web W is related tother position ofthe adhesive on the periphery of the replacement roll, the release of the brush being effected justafter the adhesive area has passed the brush zone. Also the release, ofv the brush frame. is` utilized in conjunction with the rotationV of the replacement roll to allow the, knife to be projected to sever the running (expiring). web W after the next complete rotation of the. re.- placement roll to ensure that, the. running web andl the replacement web, have become joined before severance.

An indication is given in the wiring diagram of FigureS of the manner in which this is eected. The parts in this figure corresponding to those indicated in Figures 1 and 2 are indicated by the same reference numerals. In this figure the adhesive on the replacement roll is shown at 54, and at each of the roll positions 2, 3 and 4, is disposed an adjustable cam 55 which can be set to register radially with the adhesive on the roll in the corresponding position.

When the support I is turned by the motor 5 to bring a roll thereon into the replacement position 3, the corresponding cam 55 is brought into position to operate a switch 56 which in conjunction with a web-renewing start switch 51 controls the operation of a solenoid 58 to eect the release operation of the latch 22 and hence of the brush frame I2. The brush frame is thus released to press the expiring web W against the now speeded-up replacement roll in position 3 so that when the adhesive 54 contacts the web W it adheres thereto and the web is thereafter drawn from the replacement roll. The operation of the solenoid 58 sets the knife release mechanism for operation when the cam 55 next operates the switch 5'6 and the knife is then projected to sever the expiring Web W. A combined brush and kniferelease mechanism is fully disclosed in Patent 2,182,760.

The present invention utilizes the release of the knife to close the circuit of the motor to cause automatically the raising of the belt frame 'I and the brush and knife frames I2 and I3.

This cam can be effected by causing the knife to operate a spring biased switch 59 which is held in an open position when the knife is in the sheath 23, but is closed by the spring when the knife is projected. This switch is connected in the reverse circuit of the motor 40 the forward switch of which is indicated at 6D; thus when the knife is projected, the switch 59 causes the motor to raise the belt frames 'I and this operates through the rods 41 also to swing the brush, the knife and the guide frames I2, I3 and I4 to their inoperative position.

The switch 60 by which the parts are set in readiness for a web-renewing operation can be arranged for manual control or it can be operated by a device such as a photo-electric cell which causes the switch 60 to operate the motor 4o. to lower the belt frames 1' whenV the roll'from which the web passes; isvreduced: to. a. predetermined diameter. Similarlyy the web-renewing start switch 551 can be operator` controlledz or controlled by av device such asy a photo-electricy cell' which causes. the: switch: 51: -to close, the. start circuit when` that. same roll reaches av predetermined diameter. Alternatively the switch. 51' could be operatedv through a time: control which becomes automaticallyy effective tol operate the'y switch 5.1 ata predetermined time interval after.' the closing of the belt-frame lower switcln-if.

To prevent the possibilityf oi" causing the: roltl support Iy frombeing; so turned by the-motor 5?-.as

, to carry a roll' into the belt and brush and knife frames "i, I2 and I3 while in their lowered' porci--A tion, the circuit' of,v the motor 5i is controlled' by a switch 6I which isinterlockediwith a switclr 62' controlled by a cam 631 on. the shaft 36. Whext thisshaft 36 is inthe position in which it' holdsvarious frames in their loweredv position, the motor 51: isheld.l from being energised to; drive the rolt support If. l v

The centre of rotation of the. rollf standf I andi the brush and knife frame structures I2, I3 are so arranged. that in controlling the motor 5lto` move the stand I to carryy a roll from loading position 2 to replacement position 3 the centre-.of the replacement roll lies always to that side of the vertical center which is remote from the brush and knife arrangement when swung down to this operating position as shown in Figure 1. Such an arrangement facilitates the somewhat critical positioning of the roll stand to arrest it with the periphery of the replacement roll at a given distance from the web W passing from the running roll in its predetermined path over the sheath 23 and the guide 20. The preponderance of weight at the time when the replacement roll is to be moved from loading to replacement position is on the replacement roll side of the vertical centre and there is thus no diiculty due to over-run by reason of the weight distribution. This would enable a switch or a photo-cell responsive to the position of the periphery of the replacement roll to be employed satisfactorily to control the motor 5.

What I claim is:

1. A web renewing mechanism comprising a rotatable support for a plurality of web rolls, means to move the support to carry the rolls successively into web renewing position, with the periphery of a replacement roll adjacent a web passing from a running roll on the support, a driven belt speed-up device having a belt pulley secured to a first rotatably supported shaft and in combination, arms swingable on said rst shaft, a second rotatably supported shaft having eccentrics secured thereon to swing the arms and move the speed-up device into and out of position to engage a roll in web renewing position, means to drive the speed-up device, including a rotatably driven clutch member, a cooperating clutch member on the said rst shaft, and means on the said second shaft to effect engagement of the clutch members and thereby drive the said first shaft when the said second shaft is rotated to move the speed-up device into engagement with the roll in web renewing position.

2. Web renewing mechanism for a machine to which a web is fed, comprising a support rotatable to successively bring web rolls into a web renewing position with the periphery of a full roll adjacent a web running to the machine from a nearly spent roll, means to accelerate the full roll to approximately the speed of the running web, means to reflect the running web and press it against the full roll, and means to sever the web from the spent roll, the said roll accelerating means including an endless belt driven by a first belt pulley secured to a rst shaft, and in combination, arms swingable on the first shaft and rotatably supporting a second belt pulley, a motor driven shaft adjacent the first shaft and having eccentric members arranged to engage and Swing the said arms and to operate a clutch connecting the rst shaft with a rotating element'of the machine.

3. Web renewing mechanism for a machine to which a web is fed, comprising a support rotatable to successively bring web rolls into a web renewing position, with the periphery of a full roll adjacent a web running to the machine from a nearly spent roll, means to accelerate the full roll to approximately the speed of the running web, swingable means to deflect the running web and press it against the full roll, and swingably supported means to sever the Web from the spent roll, the said roll accelerating means including an endless belt driven by a first belt pulley secured to a first shaft, and in combination arms swingable on the rst shaft and rotatably supporting a second belt pulley, a motor driven shaft adja- 8 cent the rst shaft and having eccentric members arranged to engage and swing the said arms and an actuating member for a clutch operable to connect the rst shaft with a rotating element of the machine to drive the belts, the web deflecting and severing means including crank pins carried by members rotated by the motor operated shaft, each with a connecting rod resiliently connected to swing the web deflecting and web severing means when the. said arms are swung, whereby when the motor driven shaft is rotated the full roll will be accelerated and the web deflecting and web severing means moved to operating position.

THOMAS RICHARD BENNETT.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,787,463 Wood Jan. 6, 1931 1,843,469 Wood Feb. 2, 1932 1,912,506 Wood June 6, 1933 2,009,707 Scott July 30, 1935 2,037,353 Tornberg Apr. 14, 1936 2,182,760 Horton Dec. 5, 1939 2,203,607 Wood June 4, 1940 2,249,669 Robertson July 15, 1941

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