US2141629A

US2141629A - Rewinder

Info

Publication number: US2141629A
Application number: US141451A
Authority: US
Inventors: Sterling W Warner; Lynn B Case
Original assignee: JOHN WALDRON CORP
Current assignee: JOHN WALDRON Corp
Priority date: 1937-05-08
Filing date: 1937-05-08
Publication date: 1938-12-27
Anticipated expiration: 1955-12-27

Description

1938- s; w. WARNER ET AL 2,141,629

REWINDER Filed May,8, 1937 5 Sheets-Sheet 1 'ferling M Warner BY Lynn 6. Case TTORNEY 1938- s. w. WARNER ET AL Q 2,

' v REWINDER Filed May a, 1937 5 Sheets-Sheet 2 INVENTOR'S 'Jler/in (Warner BY Lynn (85 Dec. 27, 1938. s. w. WARNER ET AL 2,141,629

REWINDER I Filed May 8, 1957 5 Sheets-Sheet s f A ORNEYS 06027, 1938. WWARNER AL I v 2,141,629

REWINDER Filed May a, 1937 5 Sheets-Sheet 4 INVENTORSI Sfer/mgnlM/mer g m1 6 Case Patented Dec; 27, 1938 PATENT oFFIc mawmnnn Sterling W. Warner and Lynn B. Case, New

Brunswick, N.

L, assignors to John Waldron Corporation, New Brunswick, N. J., a corporation of New Jersey Application May s, 1937,

31 Claims.

This invention relates to strip material rewinders and more especially to such type rewinders in which the rewind roll rests upon a pair of driven rollers which efie'ct rotation of 5 the rewindiroll by frictional contact therewith.

An object of this invention is a rewinder of the aforesaid type provided with hydraulic meansfor supporting independently of the I rollers substantially all but a predetermined 1o amount of material and associated mechanism so that the weight supported by the rollers will remain substantially constant irrespective of increase in the total weight of the rewind rollas it increases in size.

' of this invention will become apparent from the following specification and accompanying drawings, wherein:

Fig.. 1 is an elevation of one side of a rewinder embodying the invention;

Fig. 2 is an elevation of the other side of said rewinder;

Fig. -3 is a horizontal section substantiallyon empty;

Fig. 4 is a front Fig. 5 is a section on'the line Fig. 6 is an enlarged section on of Fig. 3, and

Fig. 7 is a diagrammatic view of the oil circuit.

A frame It supports a pair of horizontal rollers II and |2 which have their shafts journalled elevation partly in section; 5-5 of Fig.4; the line 5-6 the rollers are provided with gears l3 and I4, both of which mesh with a pinion IS on a shaft I6 suitably journalled in the frame In. Fixed to the shaft I5 is a pinion" which meshes with a pinion l8 .mounted on a shaft I9 suitably journalled on the frame I0 andconstituting the main drive shaft of the machine. The shaft |9 is driven byany suitable source of power (not shown) Two hollow vertical columns. 20 have their lower ends set into the frame H] and are arranged at either side of the machine. Oneach column 20 is slidablymounted a head 2| and the shaft of the rewind spindle 22 has its ends journailed in bearings formed on said heads. Each of the bearings comprises an element 23 pivoted to the head and provided with 'a' latch 24 which normally holds it in the position shown in Figs. 1 and 2. The elements 23 are swung away from the position shown in Figs. 1 and 2.to perthe total weight of the roll of -str ip 3 Other objects, novel features and advantages the line 33 of Fig. 2fwith' the rewind spindle in bearings provided on the frame.- At one end,..

mit easy removal of the "rewind spindle from the Serial No. 141,451

heads 2|. Each column 20 is provided with a pair of diametrically opposed vertical slots 25 through which each head 2| is connected to an elevating member later to be described.

Into the lower end of each column 20 extends a hollow post 26 having its lower end resting on and fixed to the base of the frame I0.

On each post 26 is slidably mounted a. sleeve 21 at the lower end of which is provided a stuffing box 21a which forms a' liquid-tight seal between the post and sleeve. Each sleeve 27 is provided with a head 21b from which guide members 28 extend through the slots 25 in the column 20 and a mast 29 extends upwardly from the head. The head 2| is attached to the guides 28 for unitary movement with the sleeve 21. A tube 30 surrounds the mast 29 and in the tube is fixed a plug 30a which is engaged by the top I of the mast 29. The tube 30 extends through the cap 3| closing the upper end of the column 20. 1 A'cap 32 closes the upper end of each tube 30 and includes a frame in which are journalled a pair of sprockets 33. On each column 20 is slidably mounted a carriage 34 and a smoothing or pressing roller 35 has theends of its shaft journalled in bearings'provided on the carriages 34. A bevel gear 36 is provided at one end of the shaft for the roller 35 and meshes with a bevel gear .31 journalled in a bearing formed on one carriage 34. The bevel gear 31 is slidably keyed t'o'a vertical shaft 38 journalled at its upper end in a bearing 39 supported by one cap 3| and at its lower end in a bearing 40 supported by the frame II]. A bevel gear 4| fixed to the shaft 38 meshes with a bevel gear 42 fixed to the shaft l6 and through the .train of gears just described rotation-of'the rollers 35 is efiected. A shaft 43 has its ends journalled in bearings formed on the carriages 34 and at each end of the shaft is provided a pinion 44 which meshes with a rack 45 formed on the column 20. a

A shaft 46 has its ends journalled in bearings provided in the caps 3| and at each end of the -shaft is provided a pinion 41 which meshes with'a rack 48 fixed to the tube 30.- A sprocket 49 is fixed to an extension of the shaft 46. A sprocket chain 50 leads upwardly from each carriage 34 over the sprockets 33 and downwardly througha coil spring 5| and is attached to a rod 52, the lower end of which is screw threaded and extends into the screw-threaded bore of a worm wheel 53 journalled in bearings formed on the frame Ill. The lower end of the spring 5| is attached to the rod 52 and its upper end is attached to the chain .50 with suficient slack in the chain to permit full expansion of the spring. Each worm wheel 53 meshes with a worm gear 54. fixedto a' shaft 55 extending transversely of the machine and provided at one side of the machine with a hand wheel 56.

A pipe 5'! leads to the bottom of each post 26 and through the pipe 51 oil or other suitable liquid is supplied under pressure to the interior of post 26 and sleeve 21 for the purpose'of elevating the mast 29 and tube 30 assembly with corresponding elevation of .the heads 2!. Upon upward movement of the tubes 30, the carriages 34 will be-elevated through the medium of the sprocketchains 50 and springs 5i which will expand when subjected to the pull applied by. the roller 35 if otherwise unsupported. Thecarriages 34 are maintained in horizontal alinement movable to control the effective area of the outlet port 0. A lever arm 6| fixed to a shaft 52 suit-- automatically oontrolli'ng'the pressure of the oil supplied to-the post 26 as well as for permitting manual regulation. A pipe 58!; leads from the outlet of the pump to a valve 59 which will later be described more in detail and a-pipe 51a leads from the valve 59 to the pipe 51'. Also, a pipe 59b also leads from the valve 59 and communicates with the bottom'of the cylinder of a valve- Cthr'ough' an inlet portion I. -A pipe59a leads from the outlet port of the valve C to the inlet of the pump 58. The pipes 58a and 51a conduct oil through the valve 59 to the pipe 51 while the pipe 59a, valve C and a pipe 59b constitute a bypass between the inlet and outlet of the pump 58. A piston 50 projects into said cylinder and is ably journalled in the frame ill rests upon the head of the piston 60 and a weight W is slidably mounted on the lever arm 6|. The pressure of the oil supplied to the cylinders 26 depends upon the position of the weight W and a rod'63 is pro-- videdfor sliding the weight back and forth on the lever' arm. An arm'64 is fixed to the shaft 62 and carries a collar 65 through which extends a rod 66. Acoil spring 61 surrounds the rod 66- and. is interposed between the collar 65 and a collar 68 attached to the rod 56. The lower end -of the rod 66 is attached to a crank arm 69 of a shaft 10 suitably journalled in the frame ill. A sprocket II is fixed to the shaft 10 and a sprocket chain 12 passes around the sprockets B9 and |l.

The spring 97 opposes the weight W and with the crank arm 69 in the position shown in Fig. 6, exerts its maximum lifting eflect on the weight W. Upon elevation of the tubes 30 rotation is eflected oi' the sprocket 49 through the medium z of the shaf (pinions 41 and racks 48, thereby effecting rotation of the shaft 10 through the intermediary of the sprockets 49 and H and sprocket'chain 12. The shaft 10 is rotated in such direction that the rod 66 moves downwardly, thereby decreasing the lifting effect ofthe spring 97 on the lever arm 64, thereby increasing the effect of the weight W on the piston 60. As a result, a higher pressure is required to lift the weight W to open the outlet port 0 in the valve C with. a consequent increased pressure applied by the liquid in the posts 26.

The strip material to be rewoundis passed from As the tubes 30 are ele- -co-operating parts.

a feed roll (not shown) under a roller I3 journalled in bearings 14 slidably mounted on vertical posts supported by the frame i0. Springs 15 are interposed between the bearings and nuts I6 sothat the roller 13 is resiliently supported. From the roller 13 the strip passes over a second guide roller 13a; then under a series of three guide rollers 13b, 13c and 13d. After leaving the guide roller 13d, the strip passes over the driving and supporting rollers I l and i2 and around the spindle 22 to which it is attached in any suitable manner; The rewind roll of strip material on the spindle 22 rests on the rollers II and I 2 and rotation of them efiects rotation of the roll by frictional contact. The roller 35 engages the roll of strip material and is driven at slightly slower peripheral speed than the rollers Ii and i2 through the medium of the gearing previously described to smooth and tighten the rolled strip.

At the beginning of the rewind operation, the weight W is set on the arm 6| at such position that pil is supplied to the post 26 and sleeves 21 at the proper pressure nearly to counterbalance the weight carried by the sleeves. As the strip material is wound up on the spindle 22, the weight and diameter of the rewound roll increase. The heads 2| and spindle 22 are moved upwardly by the increase in diameter of the rewind roll with corresponding elevationof the tubes 30 and double upward movement of the roller 35. Upward movement of the tubes 30 efiects rotation of the spindle 49 and crank arm 69 as previouslydescribed, thereby increasing the efiectiveness of the weight W as also previously described, so that the pressure of the oil supplied to the posts 26-is increased and the heads 2| support the increased weight of the roll of strip material. The movement of the crank arm 69 is such that the increase or pressure in the oil substantially counterbalances the increase of weight in the rewind roll. Adjustment of the roller 35 relatively to the spindle 22 is effected by vertical movement of the rods 52 through rotation of the worm wheels 53 by the hand wheel 56.

In each cap 3| is provided a dog 3i a to engage a notch 3Ib in the tube 30 to lock the same in elevated position. The two dogs are interconnected by a shaft 3lc at one end of which is provided a lever arm 3ld to the ends of-which are attached rods or wires 3|e and MI by means of which the dogs may be moved into and out of operative position. A

. The springs provide means for compensating-the pressure applied by the roller 35 to the roll of material wound on the spindle 22. The force applied by the roller 35 to the roll of strip material on the spindle 22 operation of the hand wheel 55. Rotation of this may be varied by wheel in such direction as to move the rods 52 downwardly causes expansion of the springs 5l' with consequent decrease intheforce applied by the rolls 35 to the roll of strip material. By means of the adjustment just described, the weight applied to the rewind roller may be regulated in accordance with its width ,so that the same pressure may be applied to'the rewind roll by the roller 35 irrespective .of the width of the strip material which is being rewound.

The valve 59 isprovided with additional con- ,nections which permit manual control of the raising and lowering'of the sleeves 21 and their The valve comprises a tubular casing in which isslidably arranged a piston 85 provided with an operating handle 81L Ports", 18, I9, and 8| are provided in the casing and the lower end of the piston 86 has a in the first on bottom position.

portion 82 of reduced diameter. The pipe 58a leads to the port 19 while the pipes 51a and 59b lead from the port 18. A pipe 83 leads from the port 11 to the pipe 59a and a pipe84 leads from the port 80 to the pipe 51. The piston 86 has four operating positions and in Fig. 6 is shown oil flows from the

pump ports

19 and 80 and through

pipes

84 and 51 to the post 26. The piston is arranged in its first position when it is desired to elevate the sleeves 21 under manual control. In'the second or next higher position of the piston 86, communication is interrupted between the

ports

18 and 80 so that oil cannot flow in either direction, thus locking the sleeves 21 in any desired position of elevation. In the third or next higher position of the piston 86, the port 8| is put in communication with the port 18, thus conditioning the device for automatic operation as previously described. In the fourth or highest position of the piston 86,

.the port I1 is brought into communication with the port 18, thus permitting oil to flow from the post 26 through the pipe 51a and pipe 83 and pipe 59a to the pump inlet, thus permitting descent of the sleeves 21 under manual control.

A by-pass 85 between the pump inlet and pump outlet controlled by a suitable relief valve 85a is provided in the usual manner. The valve 59 provides means for disconnecting the automatic valve C and utilizing the total pump pressure to lift the heads 2| to any desired height for the purpose of removing the roll of rewound strip material or for moving the heads and carriages up and down for any other purpose. By reason of the fact that the tubes 30 are slidable on the masts 29, the tubes may be held in elevated position with the masts 29 and sleeves 21 in lowered position.- A vent 86 is provided in each tube 30 just below the p1ug30a to permit ingress and egress of air upon relative movement of the mast and tube. 4

We claim:

1. A device of the character described com prising a pair of parallel horizontal rollers, a rewind spindle above said horizontal rollers, means supporting said rewind spindle for vertical movement, a smoothing roller for engagement with strip material wound on said rewind spindle, means supporting said tical movement, interconnections between said two vertically movable supporting means for effecting relative movement of said two means with the extent of movement of the second means being substantially twice that of the first means, means for applying hydraulic lifting pressure to said first supporting means, and means for varying said applied pressure.

2. A device of the character described comprising a pair of parallel horizontal rollers, a rewind spindle above said horizontal rollers, means supporting said rewind spindle for vertical movement, a smoothing roller for engagement with strip material wound on said rewind spindle, means supporting said smoothing rollerfor ver- -tical movement, interconnections between said two vertically movable supporting means for effecting relative movement of said two means with the extent of movement of the second means being twice that of the first means, means for applying hydraulic lifting pressure to said first supporting means, and means for varying said appliedpressure in accordance with the elevation of said first means.

In this position, 58 through the pipe 58a,

smoothing roller for ver--' slidably mounted on each' column,

- journalled in said carriages, sprockets means for said rewind spindle carried by said movable sections, a smoothing roller above said rewind spindle and adapted to contact with a roll of material in said spindle, means supporting said smoothing roller for vertical movement, a pulley carried by each movable section, a cable passing over each pulley and connected at one end to said last-named meansand at its other end to the frame, and means for varying the pressure of the liquid supplied to said extensible tubular members. 1

4. A device of the character'described comprising a frame, a pair of parallel'horizontal rollers journalled in said frame, a vertical extensible tubular member at each end of said rollers, each tubular member comprising a fixed and a movable section, means for supplying liquid under pressure to said tubular members, a rewind spindle above said pair of rollers, supporting means for said rewind spindle carried by said movable sections, a smoothing roller above said rewind spindle, means supporting said. smoothing roller for vertical movement, pulleys carried by said movable sections, cables passing over said pulleys and connected at one end to said lastnamed means and at the other end to said frame, and means for varying the pressure of the liquid supplied to said tubular members in accordance with the elevation of said rewind spindle.

5. A device ofthe character described comprising a frame, a pair of parallel-horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, means for supplying liquid under pressure to said tubular members, a head slidably mounted on each column, connections between said heads and movable sections for effecting unitary movement thereof, a rewind spindle above said pair of rollers and journalled in said heads, a carriage slidably mounted on each column above said head, a smoothing roller journalled insaid carriages, sprockets supported by said movable sections at the upper ends thereof, sprocket chains passing over said sprockets, each chain being connected at one end to one of said carriages and at the other end to said frame, and means for varying tht: pressure of the liquid supplied, to said extensible tubular members.

6. A device of the characterdesc'ribed comprising a frame, a pair of parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, means for supplying liquid under pressure to said tubular members, a head connections between. said heads. and movable sections for effecting unitary movement thereof, a rewind spindle above said pair of rollers and journalled in saidheads, a carriage slidably mounted on each column above said head, a smoothing roller supported by said movable sections at the upper ends thereof, sprocket chains passing over said sprockets, each chain being connected at one end to one of said carriages and at the other end to said frame, and means for varying the pressureof the liquid supplied to said tubular members in accordance with the elevation of said rewind spindle.

spindle above said pair of rollers and journalled in said heads, a carriage slidably mounted on each column abovetsaid head, a smoothing roller journalled in said carriages, sprockets supported by said movable sections at the upper ends thereof, sprocket chains passing over said sprockets, each chain being connected at one end to one of said carriages and at" the other end to said frame, racks on said columns, a shaft journalled in said carriages, pinions fixed to said shaft'and meshing with said racks, and means for varying the pressure of the liquid supplied to said-tubular extensible members. 8. A device of the character described comprising a frame, a pair of parallel horizontal rollers journalled in said frame, a column at each .end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, means for supplying liquid under pressure to said tubular members, a head slidably mounted on each column; connections between said heads" and movable sections for effecting unitary movement thereof, a rewind spindle above said pair of rollers and journalled in said heads, a carriage slidably mounted on each column above said head, a smoothing roller journalled in said carriages, sprockets supported by said movable sections at the upper ends thereof, sprocket chains passing over'said sprockets,

each chain being connected at one end to one of said carriages and at the other end to said frame, racks on said columns, a shaft journalled in said carriages, pinions fixed to said shaft and meshing with said racks, and means for varying thepressure of the liquid supplied to said tubular members in accordancewith the elevation of said rewind spindle. l

9. A device of the character described comprising a frame, a pair of parallel horizontal rollers journalled in said frame, a vertical extensible tubular member at each end of said rollers, each tubular member comprising a fixed and a movable section, means for supplying liquid under pressure to said tubular members, a rewind spindle above said'pair of rollers, supporting means for said rewind spindle carried by said movable sections, a smoothing roller above said rewind spindle, means supporting said smoothing roller for vertical movement, sprockets carried by said, movable sections, sprocket chains passing over said sprockets, each chain being connected at one end to said smoothing-roller supporting means, extensible springs connected at one'end to said frame and at the other end to said sprocket chains, and means for varying the pressure of the liquid supplied to said tubular members in accordance'with the elevation of said rewind spindlef 10. A device of 'the character described comprising a frame. a pair of parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, means for supplying liquidunder pressure to said tubuluar members, a head slidably mounted on each column, connections between said heads and movable sections for effecting unitary movement thereof, a rewind spindle above said pair of rollers and journalled in said heads, a carriage slidably mounted on each column above said head, a smoothing roller journalled in said carriages, sprockets supported by said movable sections at the upper ends thereof, sprocket chains passing over said sprockets, each chain being connected at one end to oneof said carriages, extensible springs connected at one end to said frame and at .the other end to said sprocket chains and means for varying the "pressure of the liquid supplied to said tubular members in accordance with the elevation of said rewinding spindle.

11. A device of the character described comprising a frame, a pair of parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, means for supplying liquidunder pressure to said tubular members, a head slidably moun'ted'on each column, connections between said heads and movable sections for effecting unitary movement thereof, a rewind spindle above said pair of rollers and journalled in said heads, a carriage slidably mounted on each column above said head, a smoothing roller journalled in said carriages, sprockets supported by said movable sections at the upper ends there,

of, sprocket chains passing over said sprockets,

each chain being connected at one end to one of saidcarriages, extensible springs connected at one end to said frame and at the other end to said sprocket chains, racks on said columns, a shaft journalled in said carriages, pinions fixed to said shaft and meshing with said racks, and

means for varying the pressure of the'liquld supplied to said tubular members in accordance with the elevation of said rewind spindle.

12. A device of the character described comprising a frame, a pair of parallel horizontal rollers journalled in said frame, a vertical extensible tubular member at each end of said rollers, each tubular member comprising a fixed and a movable section, means for supplying liquid under pressure to said tubular members, a rewind spindle above said pair'of rollers, supporting means for said rewind spindle carried: by ,said movable sections;a shaft having a rack and pinion connection with said movable sections, and means controlled by the rotation of said shaft for varying the plied to said extensible tubular members,

13. A device of the character described comprising a frame, a pair of parallel horizontal rollers journalledin said frame, a vertical extensible tubular member at each end of said rollers, each tubular and a movable, section, means for supplying liquid under pressure to said tubular members,

a rewind spindle above said pair of rollers, supporting means forsaid rewind spindle carried by said movable sections, a'smoothing roller above said rewind spindle, means supporting said smoothing roller for vertical movement, a pulley carried by each movable section, a cable passing over each pulley and connected at one end to said last-named means and -at. its other end to member comprising a fixed pressure of the liquid supthe frame, a shaft having a rack and pinion connection with said movable sections, and means controlled by the rotation of said shaft for varying the pressure of the liquid supplied to said tubular members.

14. A device of the character described comprising a frame, a pair of parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, means for supplying liquid under pressure to said tubular members, a head slidably mounted in each column, connections between said heads and movable sections for effecting unitary movement thereof, a rewind spindle above said pair'of rollers and journalled in said heads, a shaft having a rack and pinion connection with said movable sections, and means controlled by rotation of said the pressure of the liquid supplied to said tubular members.

15. A device of the character described comprising a frame, a pair .of parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular -member in each column comprising a fixed and .a movable section,

means for supplying liquid under pressure to said tubular members, a head prising a frame, a pair of parallel horizontal rollers, each tubular member comprising a fixed slidably mounted oneach column, connections between said heads and movable sections for effecting unitary movement thereofpa rewind spindle above said pair of rollers and journalled in said heads, a carriage slidably mounted on each column above said head, a smoothing roller journalled in said carriages, sprockets supported ,by said movable sections at the upper ends said I thereof, sprocket chains passing over sprockets, each chain being connected at one end to one of said carriages and at the other end to said frame, a shaft having a rack and pinion connection. with said vmovable sections, and

means controlled by rotation ofsaid shaft for varying the pressure of the liquid supplied to said tubular members.

16. A device of the character described comprisinga frame, apair of parallel horizontal rollers journalled .in said frame, a-vertical extensible tubular member at each end of said rollers, each tubular member comprising a fixed and a movable section, a rewind spindle above said pair of-rollers, supporting means for said rewind spindle carried by said movable sections, a pump for supplying liquid to said tubular members, a by-pass around said pump, a valve in said by-pass, a weighted lever tending to close said valve, and means responsive to the elevation of said rewind spindle for controlling the amount of weight-applied to said valve.

17. A device of the character described comin said frame, a vertical exmember at each end of said rollers journalled tensible tubular and a movable section, a rewind spindle above said pair of rollers, supporting means for said rewind spindle carried by said movablesections, a pump for supplying liquid to said tubular members, a by-pass around said pump, a valve in said by-pass, a weighted lever tending to close said valve, a spring opposing the action of said the elevation of ness of said spring.

18. A device of the character described comprising a frame, a pair of parallel horizontal shaft for varying members, a by-pass a movable section,

rewind spindle carried by said movable sections,. liquid to said tubular a pump for supplying members, a 'by-pass around said pump, a valve in said by-pass, a weighted lever tending to close said valve, a crank arm, tween said crank arm and lever, and means actuated by said movable sections for rotating said crank arm to vary the effectiveness of said spring. I

19. A device of the character described comprising a frame,- a pair of parallel horizontal rollers journalled in said frame, a vertical extensible tubular member at each end of said rollers, each tubular member comprising a fixed and a movable section, a rewind spindle above said pair of rollers, supporting means for said rewind spindle carried by said movable sections, a pump for supplying liquid to said tubular v around said pump, a valve in said by-pass, a weighted lever tending to close said valve, a crank arm, a spring interposed between said crank arm and lever, a shaft having rack and pinion connection with said movable sections, and driving connections between said shaft and crank arm.

'20. A device of the character described comprising a frame, a pair of parallel horizontal rollers journalle d in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, a head slidably mounted on each column,. connections between said heads and movable sections for unitary movement thereof, a rewind spindle above said rollers and journalled in said heads, a shaft supported by said columns and having a rack and pinion connection with each movable section, a pump for supplying liquid to said tubular members, a bypass around said pump, a valve in said by-pass, a weighted lever tending to close said valve, and means operated 'by said shaft for controlling the amount of weight supplied to said valve.

21, A device of the character described comprising a frame, a pair of parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising a fixed and a headslidably mounted on each column, connections between said heads and movable sections for unitary movement thereof, a rewind spindle above said rollers and journalled in said heads, a shaft supported by said columns and having a rack and pinion connection with each movable section, a pump for supplying liquid to said tubular members, a by-pass around said pump, a valve insaid by-pass, a weighted lever tending to close said valve, a spring opposing the action of said lever, and means operated by said shaft for reducing the effectiveness of said spring.

22. A device of the character described comprising. a frame, a pair of parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, a head slidably mounted on each column, connections between said heads thereof, a rewind spindle above said rollers and journalled in said heads, a shaft supported by a spring interposed beand movable sections for unitary movement the latter to varythe effectiveness of said spring.

23. A device of the character described comprising a frame, a pair of parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising afixed and a movable section,

said columns and having a rack and pinion connection with each movable section, a carriage slidably mounted on each column above said head, a smoothing roller journalled in said car- 7o riage slidably mounted on each column above each end of said riages, sprockets supported by said movable sections at the upper endsthereof, sprocket chains passing over said sprockets, eachchain being connected at one end to one of said carriages and at the other endto said frame, a pump for supplying liquid to said tubular members, a by-pass around said pump, a valve in said by-pass, a weighted lever tending to close said valve, and means operated by saidshaft for controlling the amount of weight supplied to-said valve.

24. A device of the character described comprising a frame, a pair ofv parallel horizontal rollers journalled in said frame, a column at each-end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, a head slidably mounted on each column, connections between said heads thereof,

,said columns and having a rack and pinion connection with each means operated by said shaft for reducing the effectiveness of said spring.

25. A device of the characterdescribed comprising a frame, a pair ofparallel horizontal rollers journalled in said frame, a column at rollers, an extensible tubular member in each column comprising a fixed and a movable section,

said head, a smoothing roller journalled in said carriages, sprockets supported by said movable sections at the upper ends thereof, sprocket chains passing over said sprockets, each chain a head slidably mounted on sprockets, each chain being tubular members,

said spring.

26. A device of the character described oomprising'a frame, a pairof parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column a movable section, a head slidably mounted on a by-pass around said pump, a valve in said by-pass, a weighted lever tending to close said valve, and means operated by said shaft, for controlling the amount of weight supplied to said valve.

27. A device of the character described comprising a frame, a pair of parallel horizontal rollers journalled in said frame, a column at each end of said rollers, an extensible tubular member in each column comprising a fixed and a movable section, a head slidably mounted on each column, connections between said heads and movable sections for unitary movement thereof, a rewind spindle above said rollers and chains, a pump for supplying liquid to said tubular members, a by-pass around said pump, a

each end of said rollers, an extensible tubular nection with each movable section, slidably mounted one end to one of said,

supplying liquid to said parallel horizontal, rollers journalled insaid frame, a column at amnes a head, a smoothing roller journalled in said car riages, sprockets supported by said movable sections at the upper ends thereof, sprocket chains .passing over said sprockets, each chain being connected at one end to one of said carriagesjf extensible springs connected at one eiid to said frame and at the other end to said sprocket chains, a pump for supplying liquid to said tu'bular members, a hy-pass around said pump, a valve in said by-pass, a weighted lever tending to close said valve, a crank arm, a spring interposed between said crank'arm and lever, and driving connections between said shaft and crank arm for rotating the latter to vary the effectiveness of said spring.

29. A device of the charactendescribedaccording to claim 26 characterized by racks on said columns, a shaft journalled in said carriages and pinions fixed to said shaft and meshing with said racks.

*i" 30. A device of the character described according to claim 27 characterized by racks on said columns, a shaft journalled in said carriages and pinions fixed to said shaft and meshing with said racks. V I

31'. A device of the character described according to claim 28 characterized by racks on said columns, a shaft joumalled in said carriages and pinions fixed to said shaft and meshing with said racks. i STERLING W WARNER.

LYNN B. CASE.