US 2733018 A
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C. D. NITCHIE Jan. 31, 1956 WEB WINDER 2 Sheets-Sheet 1 Filed Oct. l, 1953 www.
INVENTOR ATI-ORNEYS JQ mlb m m m Q i m\\\ Q om Ilm: w Q. m
c. D. NrrcHlE 2,733,018
Jan. 31, 1956 WEB WINDER 2 'Sheets-Sheet 2 Filed Oct. 1, 1953 l l I l l I INVENTOR United States Patent WEB WmDEn Charles D. Nitcilie, Haddouiieid, N. 5., assigner to Samuel 13W. Langston Co., Camden, N. J., a corporation of New ersey Application ctober 1, 1953, Serial No. 383,657
16 Claims. (Cl. 242-66) This invention relates to web winders of the 3-roll type, such as shown in the Langston et al. Patent 1,488,126 and the Sieg Patents 1,827,802, 1,831,201 and 1,888,810, and in which the rewind roll is supported on and between a pair of parallel drums which are rotated in the same direction from a suitable source of power, and a pressure roller which may or may not be driven, rests on the rewind roll and is forced upwardly as said rewind roll increases in diameter. In connection therewith there may be provided the customary slitters for trimming the edges of the sheet, and if desired, slitting the web into narrower widths as it passes from the supply roll to the rewind roll.
The present invention provides a pressure iiuid system for (l) lowering the upper pressure roller onto a small roll at the start of winding operation; (2) automatically controlling and yieldingly resisting the vertical movement of the upper pressure or rider roller so that the roll is pressed down onto the driven supporting drums and a hard, dense roll is formed, and slipping of the roll on the supporting rollers is prevented; (3) automatically controlling the downward pressure exerted by the pressure roller to compensate for the increasing weight of the roll; and (4) lifting said pressure roller above the rewind roll when the latter has reached theV desired size and is to be discharged.
Heretofore the means for applying the pressure on the upper roller has been heavy weights; and a motor, or a large hand wheel and gearing has been provided for lifting the pressure roller when the rewind roll reaches the desired size and is to be removed. A friction brake has also been provided on the upper floating roller to resist its lifting and increase the tension on the web. Under the old brake system of pressurizing the rewind roll the amount of pressure applied and the rate of reduction were left entirely to the operators discretion, and inattention often resulted in poorly wound rolls.
The main objects of the present invention are to overcome these and other objection to such prior constructions, and particularly to reduce to the minimum the physical eiiort required by the operator when removing a rewound roll and starting a new one, and to eliminate the use of counter-balancing weights and friction brakes.
A further object is to provide simple and eective means for controlling the application of fluid pressure to the pressure roller, whereby the amount of pressure exerted by the upper roller on the rewind roll may be varied, and the iiuid under pressure may be utilized to lift the roller or to force it down.
One of the primary reasons for the hydraulic means of manipulating the pressure roll is that on large winders the roiler and bearings must of necessity be heavy to withstand the pressure and speed. This great weight makes it almost impossible to manipulate them manually.
As an important feature of the invention the bearings for the upper roller are secured to chains or tension members intermediate of their ends, the ends of the chains or tension members are anchored, loops are formed adjacent to each end, and means are provided for shortening one loop and lengthening the other to raise or lower the pressure roller.
As another feature of the present invention hydraulic means are employed, and act on the chains to raise, lower, counterbalance and load the pressure roller, whereby any desired amount of pressure may be exerted, and in either direction.
In the accompanying drawings there is shown only one embodiment of the invention, but it will be understood that various changes may be made within the scope of my invention. In the drawings:
Fig. l is an end view of a machine embodying the invention.
Fig. 2 is a perspective view of only those parts of the machine which embody the novel features, certain parts of the conventional frame being shown in dot and dash lines.
Fig. 3 is a somewhat diagrammatic showing of a hydraulic control system, and
Figs. 4 and 4a are sections through a control valve in the positions for hand and for automatic operation.
The machine illustrated has lower side frame members 1 and .1', upright side frames 2 and 2', a base 3, and an upper rear cross-tie 3. The roll A being wound is supported on and between winding drums 4 and 4 mounted in bearings 5 and 5' on the side frames l and l. The pressure or rider roller 5 is mounted in carriages 7 and 7 which may move up and down along gibs 1G and i0 on the front edges of the frames 2 and 2. t is driven by a pair of motors 6' mounted one on each of thecarriages 7 and 7', and by V.-belt drives, as shown in Fig. l. T he carriages have journals carrying a shaft 9 having gears 8 meshing with racks 8a and Sb on the end frames so as to maintain the pressure roller 6 parallel to the roll supporting drums 4 and 4 at all times. he web W of paper to be wound passes around idlers 2d and 25, and then if desired between slitters 27, 27 which trim the edges. The web then passes up and around the front drum 4 to the rewind roll A.
All of the parts hereinbefore specically referred to may be of the same general type employed in machines for the same purpose.
In my improved construction there are provided a pair of double acting hydraulic cylinders 11 and 11 mounted in substantially vertical positions on the end frames 2 and 2', ln each cylinder there is a piston 11a with a piston rod 12 extending through the upper cylinder head and a piston rod 13 extending through the lower cylinder head.
An important feature of the invention relates to the means for controlling the delivery of pressure uid to the lower ends of the cylinders 11, 11 to lower the pressure roller 6 onto the small roll at the start of the winding operation; to press the roller down on the roll so that it will not slip on the drums 4 and 4'; to maintain the pressure on the roll as it increases in size; and to lift the pressure roller above the roll when the roll has reached the desired size; so that the roll may be removed.
As shown in Fig. 3, each of the upper piston rods 12 is of larger diameter than the connected lower piston rod 13, so that the elective area of the upper side of each piston is substantially less than the effective area of the underside. Thus, if the same pressure per square inch be applied simultaneously to both surfaces of the piston, the piston will travel upwardly or will exert an upward pressure equal to the pressure per square inch times the diterence in area of the ends of the piston measured in square inches.
As shown in Figs, 1 and 2, each rod 12 carries a sprocket 16 at its upper end, and each rod 13 carries a sprocket 19 at its lower end. One end of each of the chains 15 is anchored at the `lower partxof the frames, as at X onV the -base 'of `the machine, and "the other end -is anchored at the upper part of the frame, as -at the point Y. From the anchorage X the chain extends over the idler sprocket i9 on 'the piston rod 13, then beneath an idler 20, then into engagement with a sprocketSl, the function of which will be explained hereinafter, then to a sprocket 2l on the lower part ofthe main frame, and then up the frame to the carriage 7 `to which it is secured. it then extends over sprockets i8 and 17, then down and beneath the sprocket i6 on the upper end of the piston rod i2, and up to the anchorage Y. .Y
To start :the Winding of a roll the end of the web is passed over the idler 24 and beneath the idler 25 and wound a few times around the spindle or rewind shaft 22. This is then placed on and between the winding drums 4 and 4', and pressure fluid is delivered to the lower end of each cylinder il, l1' to lower the top or pressure roller 6 onto this small roll. At this time the pistons lla are in the upper position in the cylinders, the loop around the sprocket 19 is long, and the loop around the sprocket .i6 is short. As the roll increasees in size the pressure roller 6 is forced upwardly, the upper loop increases in length, and the lower loop decreases in length. When the roll reaches the desired size the pressure roller 6 is lifted, and the roll is removed.
After the shaft 22, with a few turns of web wound thereon, has been placed on the drums 4 and 4 the selector Y valve 46 is moved to hand position, shown in Fig. 4, and the pilot valve 47 is adjusted to lower the pressure roller into contact with the small roll on the rewind shaft. The selector valve 4,5 is then moved to automatic position shown in Fig. 4a, and the pilot valve 48 is fully closed by cam 49 and full pressure is exerted on the roll.
The sprocket l hereinbefore referred to and driven by the chain l5, drives a cam 49 through a worm gear speed reducer 52 which causes the cam 49 to make one complete revolution during the full travel of the pressure roller 6 from its lowermostrposition on a small roll to highest position on a large roll. The cam controls a pilot valve 48, as shown at the upper right hand side of Fig. 3, and thus the range of pressures in the line 43 from a maximum down to that at which the weight of the presf sure roller 6 is completely counterbalanced. At the'discharge side of the valve 48 a line 50 drains liquid to the Vreservoir 2S.
As the diameter of the roll increases the cam 49 opens pilot valve 48, thus automatically compensating in reduced pressure on the pressure roller for the weight gained by the roll as it increases in size, thus keeping the tractive pressure on the drums constant.
The amount of pressure applied and rate of reduction is varied by changing the spacing between the valve 43 and the cam 49, or by substituting a cam of different contour. Y
AsV shown in Fig. 3, pumps 29 and 30, driven by a motor 31 through a common shaft 152-32', draw oil from reservoir 2S and deliver it to pipe 33 under pressure indicated by the gauge 34. Pump Z9 is a large volume low pressure pump, and pump 3G is a low volume high pressure pump. When the roll A reaches the desired size, or under conditions when it is desirable to raise or lower the roller 6 rapidly, the pump 29 delivers a large volume of oil at moderate pressure, but where high pressure is required for pressing a small roll down onto the drums 4, 4', the pump '29 is unloaded and a smaller volume of oil under higher pressure is delivered bythe pump 3d. This switchover is controlled by a pilot operated relief valve 35. When the pressure in line 33 is that produced by the pump 29 the oil pressure in pilot line 3S is insuil'lcient to open the spring pressed relief valve 35, and all of the oil from both pumps iows into line 33 past check valve 3%, and out ,to the system .throughline When the pressure Vin fligne .33 exceeds the rating of `pump .29, the .pressure of the -oil in line 3 8 lifts the spool in valve 35 and opensit against the action of a spring to the drain line 40, thusrendering 'the pump 29 inerective yand leaving only pump 3l) to supply high pressure oil to the system. Check valve 37 prevents reverse ow from line 33. Relief valve 36 prevents the pump 3i) from producing excessive pressure, as it perbypassing of some of the oil to the reservoir 2.8 through drain line 41.
Bypass valve 42. is spring pressed, and the spring is adjusted to maintain a predetermined pressure in line 33a. This predetermined pressure which is applied to the top of cylinders Si and il is set suflciently high so that when line 43 opens to drain line 40 through valve 44, the'pressure roller will be lifted. The eifective piston area .in the upper ends of cylinders li and 1l is approximately onehalf of that in the lower ends, due to the upper rods l2,
i2 being larger than the lower rods i3, i3. Thus, if anY equal pressure is applied to opposite ends of the cylinder simultaneously, the piston will move up or exert anup- Ward pressure equal to the pressure in pounds multiplied by the difference in square inches of the areas of the two ends. f Y
-Valve 44 is a pilot operated relief valve which may be controlled by either of two pilot valves 47 or 48, Ydepending upon the position of selector valve 46. Valve 44 controls the pressure in line 45, and in the bottom chambers of cylinders 1l and l1. When the valve is in the position shown inrFig. 4 for hand operation, the pipe 45 is connected to the valve 47. When it is in the position shown in lFig. 4a for automatic operation, the pipe 45 is connected to the valve 48, and the valve 47 is out of circuit.
With either pilot valve 47 or 43 open, the main spool of valve 44 will shift to the open position, thus reducing the pressure in line 43 to zero. Under this condition, the pressure in line 33 will act only on the upper side of the pistons' 11a in cylinders 11 and l1', and will move them down to raise the pressure roller 6.
. if pilot valves 47 or 48 are closed slightly, valve 44 will close proportionately, and raise the pressure in line 43 to a value which, acting upon the large pistony area in the bottom of cylinder 1l, willcounteract the thrust from the top of the cylinder, and the pistons will come to rest:
lf pilot valve 47 is closed further, the pressure in the bottom of the cylinder will overbalance thatin the top, and the pistons will move upward toV lower the pressure roller or exert a higher pressure on the roll of material being wound.
Closing pilot valves 47 or 4S will cause valve 44 to tightly close, and full line pressure from the pump will be applied to both Vends of the cylinders', with the result that downward pressure will be applied on the winding roll, and equal to the weight of the pressure roll as-V sembly plus the `product of the pressure in line 33a and the difference in area of Vthe two ends of the cylinders. Fig. 4 shows the oil passages in selector valve 46 in lthe hand position, and Fig. 4a vshows them in automatic position. in the hand position the pilot line 45 is connected to manual pilot valve 47, andvtherpressure roller may be raised or lowered manually by adjusting the control knob on valveV 47. kIn this position Valve 4S is connected to drain line '56. In the automatic position of selector valve`46, shown in Fig. 4a, the pilot valve 4S is connected to pilot line 45, and Valve 47 is connected to drain line 50.
`Pilot valve 48 is controlled by a cam 49 mountedon the low speed lshaft of a worm gear speed reducer 52 which is driven by sprocket 51 from chain 15. The ratio ofthe worm Ygear box .is such that the full travel of the chain 15 is reduced to one revolution of the cam 49.
The difference in the low and high radii of the cam 49 is equal to that amount of travel of pilotV valve48 which will ,cover thezrange of pressures in line 43 from maximum down to .that at which the weight of the pressure'roller is completely counterbalanced.
avasprs In operation, the operator threads the web W around the rewind shaft 22 and places it in the crotch between drums 4 and 4', then with selector valve 46 in the hand position shown in Fig. 4, he adjusts pilot valve 47 to bring the pressure roller down into contact with the small roll on the rewind shaft 22. He then moves the selector valve 46 to the automatic position shown in Fig. 4a. In this position of the pressure roller, cam 49 holds pilot valve 48 fully closed so that full pressure is exerted on the roll being wound.
As winding begins and the diameter of roll A increases, the cam 49 starts slow rotation and gradually opens pilot valve 4S, thus automatically compensating in reduced pressure on the pressure roll for Weight gained by roll A as it increases in size, and keeps the tractive pressure on the drums 4 and 4' constant.
It is obvious that the amount of pressure applied and the rate of reduction may be varied by changing the spacing between valve 48 and cam 49, or by altering the contour of cam 49.
Having thus described my invention what I claim as new and desire to secure by Letters Patent is:
l. A Web Winder of the type in which the rewind roll rests on and is rotated by a pair of parallel driven rollers and a pressure roller rests on the roll and is moved upwardly along the frame members as the rewind roll increases in size, said Web Winder being characterized by having a cylinder, a piston therein, a piston rod having opposite end sections projecting respectively through the end walls of said cylinder, a chain having its ends anchored on said frame .and its intermediate portion connected to the pressure roller, and having a pair of loops at opposite sides respectively of said intermediate portion, an idler sprocket in each of said loops, said sprockets being mounted on and carried by the respective opposite ends of said piston rod, and means for applying fluid pressure to said cylinder.
2. Mechanism for raising, lowering and resisting upward movement of the upper roll of a three-roll web winding machine, said mechanism including a freely ilexible member having its ends anchored, its intermediate portion secured to the bearings of said upper roll, and provided with loops in the opposite end portions, a cylinder having a piston and piston rod sections extending from opposite ends of said cylinder, the ends of said sections having idler sprockets in said loops, and means for applying uid pressure to said cylinder` 3. A web winding machine of the type having a pair or driven rollers for supporting thereon and therebetween a rewind roll, a vertically movable pressure roller for engaging the upper side of said rewind roll, and having vertically movable bearings, whereby said roller rises as the roll increases in diameter, said machine being characterized by means for controlling the eiective pressure exerted by said pressure roller on said roll, said means including a freely flexible member having its ends anchored and having a pair of loops adjacent to said ends and its intermediate portion secured to the bearing of the pressure roller, a piston in said cylinder and having piston rods projecting from opposite ends of the latter, and idlers carried by said piston rod and engaging loops in said chain, and uid pressure means for regulating the forces applied to said bearing by said piston.
4. A web winding machine of the type having a pair of driven rollers for supporting thereon and therebetween a rewind roll, a vertically movable pressure roller for engaging the upper side of said rewind roll and having vertically movable bearings, whereby said roller rises as the roll increases in diameter, said machine being characterized by means for controlling the eiective pressure exerted by said pressure roller on said roll, said means including a freely iexible member having its ends anchored and having a pair of loops adjacent to said ends and its intermediate portion secured to the bearing of a pressure roller,
and means engaging said loops to extend one and shorten the other and thereby change the elevation of said pressure roller.
5. A web Winding machine of the type having a pair of lower driven roll supporting rollers and an upper pressure roller having vertically movable bearings, a freely exible non-extensible member having its ends anchored and its intermediate portion secured to a bearing of said upper pressure roller, a pressure cylinder having a piston, and a pair of idlers connected respectively to opposite sides of said piston and engaging said member adjacent to its ends, whereby upon delivering fluid to one or the other ends of said cylinder said pressure roller is raised or lowered.
6. A web winding machine of the type having a pair of frame members, a pair of roll supporting and rotating rollers journaled therein and an upper pressure roller having bearings vertically -movable on said frame, each end frame member being characterized by having a substantially vertical cylinder mounted thereon, a piston therein, and a piston rod projecting through both ends of the cylinder and having sprockets at opposite ends thereof, a chain having its ends anchored on said frame member, an intermediate portion secured to the bearing of said pressure roller and a pair of loops, one adjacent to each end, one engaging one of said sprocket `Wheels and the other adjacent to the other end and engaging the other sprocket Wheel, whereby as said roll increases in size said pressure roller moves upwardly, and hydraulic means operatively associated With said piston for exerting pressure through the latter tending to extend one loop and shorten the other to selectively lift, lower, and resist upward movement of said pressure roller.
7. A web Winder of the type having a pair of roll supporting rollers simultaneously rotated n the same direction and a vertically movable idler pressure roller, bearings for said pressure roller, said Winder having a pair of cylinders each having a piston, iiexible members connected to said pistons and to the bearings of said pressure roller for raising, lowering and pressing downwardly said pressure roller, and means for delivering a uid under pressure to both ends of each cylinder.
8. A web Winder of the type having a pair of drum roll supporting rollers and an upper vertically movable pressure roller, said Winder having a pair of cylinders each having a piston therein and piston rods projecting from opposite ends thereof, a pair of chains each having its opposite ends anchored and an intermediate portion connected to said pressure roller, and means operated by said piston rods and engaging said chains to move said intermediate portion and thereby raise or lower said pressure roller.
9. A Web Winder having a pair of rollers for supporting thereon and therebetween a web rewind roll, means for rotating said rollers thereby to rotate said roll, an upper pressure roller having vertically movable bearings, a pair of chains each having its ends anchored and an intermediate portion secured to one of said bearings, a pair of cylinders each having a piston and oppositely extending piston rods, a sprocket Wheel carried by each end of each piston rod and engaging said chain adjacent to but spaced from the ends thereof to move the intermediate part endwise and raise or lower said pressure roller. lf). A web Winder as defined in claim 9, and in which the oppositely extending piston rods are of different diameter, whereby the rate of movement in one direction is greater than the rate of movement in the opposite direction.
l1. A web Winder of the type in which the rewind roll rests on and is rotated by a pair of parallel driven rollers and a pressure roller rests on the roll and is moved upwardly along the frame members as the rewind roll increases in size, said Web Winder being characterized by having journal structures for the opposite ends of said pressure roller guided on said frame members, and a drive motor for said pressure roller mounted on each of vdownward pressure exerted Yrests on and ,is .rotated b y a pair VYof parallel driven rollers and a pressure roller rests on the roll and is moved up -wardly along the frame members as the rewind roll increases in size, said web Winder being characterized by having a motor vertically movable with said pressure roller and Aoperatively .connected to the latter for driving it.
13. A web Winder of the type having a pair of parallel juxtaposed lower roll supporting rollers and a pressure roller movable upwardly as saidroll increases in diameter, said Winder having hydraulic means responsive to said increase in diameter for automatically regulating the Y by said last mentioned roller. 14. A web Winder according to claim 13 including manually actuated meansY for operating the hydraulic means independently of said automatic means for selectively elevating and lowering the pressure roller.
l5. A web Winder according to vclaim 14 wherein the hydraulic means includes a cylinder, arpiston, said cylinder operatively connected to the pressure roller, said piston having opposite ends of diering Aeiiieetive areas exposed respectively to hydraulic pressure inthe opposite Y ends of the cylinder, vmeans for admitting (an hydraulic pressure medium from a common pressure source'to both ends of the cylinder simultaneously, and means for varying the pressure of said medium in one of tbe'said ends of the cylinder.
16. A webV Winder according to claim 15`Wherein the pressure varying means comprises a 1ray-pass for the hydraulic medium at the one end of the cylinder and an element responsive Vto the movement of the piston for controlling said by-paSS. f Y
References Cited Yin the le of this'patent UNITED STATES PATENTS