US3090576A - Roll slitting and rewinding machines - Google Patents

Description

y 1963 K. RODER ROLL SLITTING AND REWINDING MACHINES 2 Sheets-Sheet 1 Filed April 6, 1960 INVENTOR /7//7EL FODE/Z 46:35: CQNEYS May 21, 1963 K. RGDER 3,090,576

ROLL SLI'I'TING AND REWINDING MACHINES Filed April 6, 1960 2 Sheets-Sheet IN VE NTOR 9 R 2 ZN Q Q 0 ffAKL B05055 By P [/4 MN m if ATTORNEYs United States Patent 3 ($0,576 ROLL SLITTING ANl EEWENDING MACI HNES Karl Riider, Darmstarlt-Eherstadt, Germany, assignor t0 Maschinenfabrik Goehel G.m.h.H., Darmstadt, German y Filed Apr. 6, 19619, Ser. No. 20,317 Claims priority, application Germany Apr. 9, 1959 4 Claims. (Cl. 24267.1)

The invention relates to roll slitting and rewinding machines for paper, plastic or the like sheets incorporating a slitting or feed roller assembly and a rewinding shaft lo cated underneath the assembly in movable bearings to travel downwards as the diameter of the rewinding roll increases. In such machines to press the rewinding roll against the said feed roller by means of a weight or spring system or a hydraulic arrangement pressing the rewinding shaft or the supporting roller assembly upwards have certain drawbacks. If a counterweight is used which acts with a constant force, the pressure between the rewinding roll and the feed roller will decrease during the operation to the same degree as the rewinding roll increases in weight. In many cases, the decrease may go so far as to eliminate this pressure completely. This method is not applicable because the roll will become too soft on its outside.

In machines having a hydraulic pressure arrangement connected with the supporting rollers, the pressure is controlled by transmitting the movement of the supporting rollers over a cam to a contact pressure gauge which provides for a constant increase of the hydraulic pressure. The necessary control and operating means in such arrangements are very complicated and will be used for very large machines only. Moreover, the cam disk must be exchanged for different operating conditions.

Roll slitting machines of the type in which the pressure between the rewinding roll and the feed roller is caused by springs, require a substantial number of long and strong springs to ensure the necessary amount of pressure. If any of the operating conditions, say, the pressure, are altered, the springs must be changed, additional springs mounted or part of the springs removed. This is often undesirable.

This invention eliminates the drawbacks of known rnachines and an object of the invention is to provide for an easy control and change of the pressure between the rewinding roll and the feed roller which is obtained by having a pivoting or otherwise movable means follow the outside diameter of the roll, its movement being used to control the downward travel of the rewinding shaft. A further object therefore to achieve the foregoing is to make a riding or weight roller part of the pivoting or otherwise movable means whereby its pressure is adjustable by a weight connected thereto, for instance a sliding weight.

The downward travel of the rewinding shaft may be accomplished, for instance, by using an auxiliary motor which is switched on and off by the controlling means and drives a self-locking gear mechanism which is connected to the rewinding shaft by ropes, chains or rods. One means to switch the motor on and off is to have the controlling means operate a contact in its extreme position.

A still further object of the invention resides in the rewinding shaft to be supported, for instance, by hydraulic means with either end of the shaft being placed on a piston rod of each one of the hydraulic cylinders. Thereby the pressure on the liquid results from the pressure of the riding roller against the rewinding roll, with the pressure being produced, for instance, by a sliding weight. In this assembly, the rewinding shaft is lowered when a lever carrying the sliding weight and acting as the con- 3,099,576 Patented May 21, 1963 trolling means, is caused, in its extreme position, to open a valve for a number of short intervals so that a small portion of the liquid may flow from the cylinders.

Further objects will be apparent from the following description when considered in connection with the accompanying drawings in which;

FIG. 1 is a side elevation of a machine according to the invention in which the rewinding shaft is carried by cables and with a front side frame omitted,

FIG. 2 is an end view of the machine of FIG. 1 as viewed in the direction of the arrow,

FIG. 2A is a partial section showing a detail of the bearing assembly,

FIG. 3 is a side elevation of a modified machine in which a pair of supporting rollers are suspended by cables and with a front side frame omitted,

FIG. 4 is an end view of the machine of FIG. 3 as viewed in the direction of the arrow,

FIG. 5 is a side elevation of a detail of a bearing assembly of the supporting rollers of FIGS. 3 and 4, and

FIG. 6 is a top plan view with parts omitted, showing the weight-actuated pressure roller.

In FIG. 1 the unwinding shaft, not shown, is mounted in the two side frames 1. The web 2 of paper is fed from the unwinding unit over or under guide rollers 3 and 4 to the lower knife roller 5 and runs around the latter. The pivoting upper knives 6 engage into the lower knives of roller 5 to slit the web 2 into strips as desired. The strips run against a roller 7 to a riding or pressure roller 8 which rolls directly on the rewinding roll 9. As a drive means for the roll 9, Patent No. 2,158,286 of May 16, 1939, shows a drive for the windup roll in FIG. 6, and is described on page 3 in lines 16 to 23 where the Winding shaft is referred to.

The rewinding shaft 10 is carried by both ends in slide bearings 11 which move vertically in guides 12 of the two frames 1. Both slide bearings 11 are suspended by ropes, cables, or chains 13 connected at 35 and each of which passes over a stationary rotatable pulley 14 and is connected to a pulley or drum 15. When the pulleys 15 which are keyed on a shaft 16 rotate, the two slide bearings 11 travel upwards or downwards by an equal amount in accordance with the direction of rotation of the pulleys 15.

The riding or pressure roller 8 is carried on both ends in levers 33 and 34. The levers are both attached to a shaft 18 which pivots on both ends in brackets 17. A lever 19 with a sliding weight 20 is secured to the same shaft 18, and this results in that the pressure of the riding roller 8 against the rewinding roll 9 is determined only by the weight, that is the position of the sliding weight 20 on its lever 19. A desired pressure is therefore obtained by adjusting the position of the weight 20, and a scale may be provided to read the pressure of the weight.

In the arrangement described, the shaft of the riding roller 8 will generally be parallel with the rewinding shaft 10. Under certain conditions it is sometimes desirable to permit an angular adjustment of the riding roller with respect to the rewinding shaft, and in that case, it should be possible at least, on one side of the machine, tomake an adjustment, for instance by means of a screw thread between the bearing of the riding roller and its lever secured to the shaft 18.

Before starting the machine, the ropes or cables 13 should be raised up by turning the pulleys 15 until the rewinding shaft 10 completely or nearly contacts the riding or weighted roller 8. The lever 19 of the sliding weight is then in its lowest position which may be determined by a stop 21. When the rewinding shaft 10* with the web secured thereto is driven, the weight lever 19 will lift from the stop 21 and provide the adjusted pressure between the riding roller 8 and the outside diameter of the roll being started. As the roll increases in size, the lever 19 is lifted to 7 an increasing extent without, however, changing the eifective'pressure, and the one end of the lever 19 thereby abuts against a contact pin of the switch 22 to thus close a circuit. This circuit is the one in which the auxiliary motor 23 is connected which is now started and turns a worm gear 24, which meshes with a worm wheel 25 which also turns although at a considerably low- .er speed. The worm wheel 25 is fixed on the shaft 16 so that the two pulleys will turn together with the worm wheel, the direction of rotation being such that the two slide bearings 11, which are continuously under a force, will travel slowly downwards when the auxiliary motor 23 starts to turn. As a consequence, the rewinding shaft 10, the rewinding roll 9, the riding roller 8, and the lever 19 following it will also move down in order to release the pin of the switch 22 and thus stop the auxiliary motor 23. This prevents any further downward movement of the two slide bearings 11 and since this cycle is completed within a very short time, there is only a slight movement of the slide bearings. When the winding shaft 10 is rotated then the web 2 will be wound on the rewind roll 9, and thus the diameter of this roll will increase. Since the bearings for the winding roll are stationary, the increasing diameter of the roll will press against the weighted roller 8, and this roller will be lifted, which will in turn lift the arm 19 to close a. contact to thus operate the motor to lower the rewind roll, since the weighted lever 19 is pivoted at 18 and thus will cooperate with the contact at the free end of the lever. This latter will result in the motor 23 being energized, and thus the bearings and the shaft 10 will be lowered and ad jus'ted to its proper position.

When the slide bearings 11 have come to rest, the continuously rewinding roll 9 again causes the lever 19 to lift and the cycle begins once more. 'Throughout the winding operation the lever 19 is operated to cause a short lowering of the rewinding shaft each time until the final diameter of the roll 9 is reached. Since the pressure exerted on the riding roller 8 by the weight 20 is practically uninfluenced by the movements of the lever 19, there is no change in pressure during the complete winding operation, provided the weight 20 remains in its position.

If it is desired to change the pressure during the operation, which is often the case, it sufiices to adjust the weight 20 along the lever 19. This may be made manual ly or alternatively, by automatic means. By this arrangement it is possible to wind under considerable tension in the beginning with less tension on the outside of the roll which condition is often desired. When the weight lever 19 is designed as shown in the drawing, the weight 20 will always cause the weighted roller 8 to press downwards. In some cases it maybe desirable to eliminate the pressure or force towards the end of the. winding operation, and this may be accomplished by extending the lever 19 to the left, FiG. 1, beyond its pivoting shaft 18 so that the weight 20 may be displaced at least until its center of gravity is in the vertical plane passing through the shaft 18.

In FIGS. 3 to 5 the winding roll is not supported by i the rewinding shaft as in FIG. 1, but rests on supporting rollers 26 and 27 with slide bearings 11 movable in the slots 12. These latter each are carried on both ends in a cross-bar 28 attached to a slide block 29. Both slide blocks 29 are arranged within the slot 12' as guides which are provided in the two frames 1'. These slots 12 are longer than the slots 12 of FIG. 1. The slide blocks 29 are each fitted with a bracket or brackets 30 to which the ropes or cables 31 are secured. The ropes 31 on both sides of the machine each pass over a pulley 32 in the upper part of the machine and secured to a pulley '15 which is driven by the auxiliary motor 23 over a Worm gear 24', similar to the pulleys 15 in FIG. 1. The riding or weight'roller 8' is supported in hearings in the lever arms 33' and 34' which are mounted to swing on a shaft i- 18'. The shaft 18 is mounted in brackets 17', FIG. 3 mounted on the frame 1'.

The operation of this machine of FIGS. 3 to 5 is the same as described for the operation of the machine of FIG. 1. Before the winding operation starts, the rewinding shaft 19 is placed between the two supporting rollers 2 6 and 27. When the auxiliary motor 23 is driven, it pulls the ropes 31 upwards, until the rewinding shaft with the web pasted thereto touches the riding roller 8. Then the rewinding shaft 10 or the supporting rollers 2-6 and 27 or both are driven. As the rewinding roll increases in size, it lifts the lever 19 and operates the contact 22' causing the motor 23 to slightly lower the supporting rollers 26 and 27 suspended by the cables 31. This movement comes to an end as soon as the contact 2 2 is released. The cycle is frequently repeated during the winding operation until the rewinding roll 9' has reached its desired diameter.

1 claim as my invention:

1. A roll rewinding machine for paper, plastic and other webs comprising a frame, a rewinding roll for the strips of web and mounted on a shaft, a pair of slide bearings slidably mounted in guides in the frame and in which the shaft is mounted, pulleys in the frame and having means connected to the hearings to raise or lower the rewinding roll, and means operative by contact with the winding roll to operate the pulleys dependent upon the amount of web wound on the rewinding roll to adjust the position of the hearings in the frame.

2. A roll rewinding machine for paper and like webs comprising a frame, a movable pair of bearings vertically slidable in the frame, a shaft mounted in the bearings, said shaft being adapted to receive the web after being cut into strips, means for raising and lowering the bearings dependent upon the change in the circumferential size of the strips on the shaft, and a weighted roller to roll on the circumferential strips of the web controlling the operation of the last mentioned means to adjust the hearings to accommodate the changing size of the roll of strips.

3. A roll winding machine for cut paper strips and like webs comprising a frame, means for supporting a roll of out strips wound on the roll after being cut, means controlled by means in contact with the outer periphery of the roll to lower the latter in the frame as the diameter of the roll increases by the winding of the cut strips of paper thereon, and amotor mounted on the frame to operate the means to lower the roll.

4. A roll rewinding machine for paper, plastic and other webs comprising a frame, a plurality of guide rollers mounted in the frame to guide the web, a rewinding roll for the web mounted on a shaft, 21 pair of slide bearings slidably mounted in guides in the frame and in which the shaft is mounted, pulleys in the frame and having means connected to the hearings to raise or lower the rewinding roll, means including a plurality of levers, pivot means for said levers for pivoting said levers in the frame, said levers having a riding roller thereon for contact with the rewinding roll, a further lever pivoted on said pivot means and an adjustable weight slidable on said further lever for urging said riding roller into engagement with said rewinding roll, said riding roller being operative by contact with the winding roll to control the pulleys dependent upon the amount of web wound on the rewinding roll to adjust the position of the bearings in the frame.

References (Iited in the file of this patent UNITED STATES PATENTS 1,680,979 Gardner Aug. 14, 1928 2,158,286 Kohler May 16, 1939 2,360,564 Johnstone Oct. 17, 1944 2,733,019 Goodwillie Ian. 31, 1956 FOREIGN PATENTS 863,596 Germany Jan. 19, 1953

Claims (1)

1. A ROLL REWINDING MACHINE FOR PAPER, PLASTIC AND OTHER WEBS COMPRISING A FRAME, A REWINDING ROLL FOR THE STRIPS OF WEB AND MOUNTED ON A SHAFT, A PAIR OF SLIDE BEARINGS SLIDABLY MOUNTED IN GUIDES IN THE FRAME AND IN WHICH THE SHAFT IS MOUNTED, PULLEYS IN THE FRAME AND HAVING MEANS CONNECTED TO THE BEARINGS TO RAISE OR LOWER THE REWINDING ROLL, AND MEANS OPERATIVELY BY CONTACT WITH THE WINDING ROLL TO OPERATE THE PULLEYS DEPENDENT UPON THE AMOUNT OF WEB WOUND ON THE REWINDING ROLL TO ADJUST THE POSITION OF THE BEARINGS IN THE FRAME.

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