DE1927376A1 - Device for unrolling, in particular a paper web - Google Patents

Description

17 315

WESTVACO CORPORATION, New York, N.Y. / UNITED STATES

"Device for unrolling, in particular a paper web".

The invention relates to a device for unrolling a paper web or the like.

When paper is made, the finished paper generally becomes wrapped on cores for shipment to the customer, processing into sheets, or forming into paper products. the Cores are relatively small, between 5 cm to 8 cm in outside diameter (2 "- 8"). A very common size is a 7.5 cm (3 ") core with an outer diameter of 8.8 cm (3.5") lies. .

Due to the fact that the paper is wound on the core under tension over its entire length and due to the relatively long time over which the rolls are stored, the paper tends to adapt in part to the curvature created by the core. After unwinding, provides calibrated out so that the paper has assumed a permanent or Krümmungeauatand, wM as mentioned this in the industry, the paper contains "permanent tendency roll ¹¹ (engl." Curl ").

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In the outer dents of the rollers, the tendency to roll can be very slight, if it can be determined at all. However, as the paper is unwound to the core, the tendency to roll becomes more pronounced. In many cases the tendency to curl is so great that the paper cannot be used for its intended purpose. Sometimes even have up to 10 to 15 Ί "of the paper in a roll due to the so-called" role. Curvature ¹ * be thrown away. Even before the point is reached on a paper roll where the paper has to be thrown away, the existing rolling tendency can it require that a sheet cutting machine or the like. Must be braked in order to avoid building blockages in the sheet transport and stacking mechanisms.

Various types of roll biasers or unrollers have been used to reduce the loss of paper as a result of excessive roll curvature. Conventional unrolling devices made from a sharp-edged rail are suitable in many cases, the most effective being a rod with a small edge radius around which the paper web must run. The side of the paper web opposite the curl rests against the edge and causes a reverse curling tendency and thus counteracts the curvature of the roll. If the bend angle around such rails is properly adjusted, the roller bend can be removed fairly easily and in some cases the paper can be caused to curl in the opposite direction if desired. However, such rails are not | % suitable for use with high-quality or coated types of paper, since the edge of the rail tries to scratch the coated surface of the paper. Bas same <· Entrollungsproblem can occur with coated cardboard suffering I to the same mechanical rolling problems when it is stored in roll form V.

Unrolling devices with a round cross-section were also used in

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form of cylindrical rollers proposed) to eliminate the problem of scratching, but these gate directions have not been found to be satisfactory for other reasons. Namely, since the rollers were made too large in diameter, the unrolling operation could not be carried out effectively. Attempts have been made with smaller diameter rolls, and because of their tendency to deflect when stored at the ends, they have also not effectively unrolled the web. It has been found that in order to properly unroll a web of easily scratched paper, the rolls had to be on the order of 1/2 inch in diameter or smaller, with the web width being a maximum of 30 to 45 cm (12 to 18 inches) which can be used could run through. Attempts were then made to mount unrolling rollers or bars of greater width at intermediate points along their lengths in a cradle-like or pendulum-like manner by means of ball bearings or other rolling elements. For nominal web speeds of 305 meters per minute (1000 feet per minute) would have a crew of "\ _K 3 cm diameter (1/2") to rotate at 7650 revolutions per minute. It has been found that at speeds well below the above values, the small diameter rod will attempt to strike and run out of the beams.

According to the invention, this problem is now to be solved.

The invention is based on a device for unrolling a tensioned web of paper or other material with a rigid support means extending across the width of the web, a thrust bearing at each end of the rigid Carrier device, a freely rotatable rod made of magnetic, attractive material, which is mounted between the thrust bearings, a plurality of roller bearing elements, which are attached to the carrier device at locations spaced from one another to this rod cradles or pendulum-like over its length

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gladly. The invention is characterized by a large number of Magnetic devices that are connected to the bearing training at locations spaced apart from one another between the rolling bearing elements in are attached in the immediate vicinity of this rod, whereby the rod is held in place on the roller bearing element by magnetic attraction.

According to the invention it has been found that a pole can keel Diameter that rotated at high speed in the cradle formed by the roller bearing support device could be held by placing below the rod and close to it without touching it, a multitude of permanent ones Magnets or the like. Were arranged, which were arranged between spaced-apart support devices. By this measure, orbit speeds of up to 600 meters per minute (2000 feet) have been achieved without the rotating Stange hit or ran out of its bearers. It is not yet known which speed limit will ultimately be reached will be.

According to the invention, a rotatable unrolling rod of small diameter of the desired length with interposed Rolling bearing support devices spaced along their length and with novel magnet designs near the unrolling rod proposed, however, without touching them, in such a way that they are in their carriers at high rotational speeds is held.

The invention will now be described in more detail with reference to the accompanying drawings, in which

Figure 1 shows a front view of a roll breaker assembly cut in the middle;

Figure 3 shows a section along the line 3-3 in Figure 2;

Figure 2 shows a detail of a unit of the roll breaking assembly;

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Figure 4 is a section taken on line 4-4 in Figure 2;

Figure 5 is a top plan view of a roll breaker assembly, partly in section;

FIG. 6 is a cross section through a double roll crusher installation and its support device;

Figure 7 is a detail of a modified roll tendency breaking unit;

Figure 8 is a section taken on line 8-8 in Figure 7; Figure 9 shows a section along the line 9-9 in Figure 7;

Figure 10 shows a roll break rod with a plastic cover;

Figure 11 shows an end view of the plastic-covered , Rod according to Figure 10;

FIG. 12 shows a further modified roll break rod formed by a helical spring;

Figure 13 shows schematically how the roller breaker bar system can be used according to the invention as a curved roller;

FIG. 14 is a section along the line 14-14 in FIG. 13 and shows an embodiment for storage for the curved Role.

The unrolling device according to the invention is able to be installed with little space requirement and with the least possible effort making them usable to the greatest possible extent. It can be used to unroll a paper web or the like or condition while these are being fed into a printing press, an embossing press, a sheet cutter and a Stacking device or other device that performs work on the web enters. It can also be arched or a roll-up roll can be used on the paper machine to minimize creasing.

Under actual working conditions on a combined sheet cutting, inspecting, sorting and stacking paper ^ dbach-

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machine has the magnetic unrolling device according to the The invention has shown a significant decrease in paper loss due to the roll rolling tendency. The device was based on the Machine attached as an additional unit without having to change the original design of the machine.

The only requirement for a suitable installation is that the web, when it runs over the unrolling rail W , must be tensioned and allow a certain degree of movement in order to change the angle of wrap around the unrolling rail. Experiments have shown that for a rod with a relatively small diameter (1.3 cm = 1/2 "diameter), the size of the removed or induced curvature or curl increased steadily up to about 60 degrees of wrap around the rod, beyond this point It was also found that a given wrap angle induced more curl or curvature as the basis weight of the web increased or removed.

. According to the drawing, in particular according to Figure 1, the device shown mounted on a rigid support device 10 according to the invention. The carrier device 10 can in turn be mounted on movable arms, the angle of wrap of the web around the rod or they can be changed can be fastened in place at a point which allows the web wrap angle to be changed by movable guide means before and / or after the web is turned the rod is guided. In addition, the rigid support device 10 must be arranged such that the web is tensioned, when it runs over the bar and preferably be in a place that has easy access and convenience for that Operating personnel guaranteed. Figure 6 of the drawings shows an example of how the roll breaking device of the invention arranged as part of a paper finishing apparatus

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can be. There is a double installation according to FIG. 6, two stiff embossing rods 10 being shown installed on an arm arrangement 2, which are pivotable on them the shaft 7 is mounted, the latter being supported by a machine frame element 4. A similar arm arrangement and a similar frame on the opposite side of the machine support the opposite ends of the rails 10. This arrangement is used to control both the unwinding and unwinding that sometimes occurs in one and the same roll of paper. According to the representation, the Roll breaking assemblies between a pair of rolls 5, provided on the machine where the web is under tension stands. The position of one of the roll break arrangements 2 in contact with the paper web ¥ is shown in dashed lines. A single installation can be similar to a a part of the paper finishing device can be arranged.

Turning to Figure 1, there is a side view of a typical one Roller breaking arrangement given. The structural support for the arrangement comprises the rigid rail element 10 of rectangular cross-section as shown in Figures 3 and 4. The rail element 10 need not necessarily be rectangular in cross-section, as long as it is rigid enough to prevent excessive deflection. There is one at the head of the splint Groove or slot 16 machined to allow precise alignment of the bearing blocks 12 and magnets 26 to ensure. The supporting bearing blocks 12 are attached to the rails by means of screws 14 - FIG. 4. the Magnets are fastened in a similar way by means of screws 28 - FIG. 3.

Figure 2 is an enlarged view of the right end of the assembly of Figure 2 and shows the rolling tendency break bar 30, the end thrust bearing 32, the end block 33, the bearing Support blocks 12, the bearing shafts 20, the bearing spacer

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Pieces 18 and 19, the bearings 22, 24 and the magnets 26. The roll break rod 30 is preferably made of case-hardened and ground tool steel with a Rockwell 0 hardness of about 60. Chrome plating or electroplating can also be provided. Other materials can be used as long as they are only magnetically attractive. Each end of the rod is machined and a thrust bearing 32 is lightly pressed thereon. The end block 33 is rigidly attached to the rigid support rail 10 by means of screws 35 - FIG. 5. An opening 34 is recessed in the surface of each end block 33 to receive a bearing 32, leaving a clearance of about 1.6 mm (1/16 ^B ) in all directions. This play enables the rod to position itself freely on the bearing bearings 22, 24 and ^{to allow end-face flow 11} in order to compensate for the thermal expansion of the rod to prevent accidental loss of the rod in any abnormal condition from momentarily knocking the rod out of the cradle formed by bearings 22, 24. Bearing blocks 33 are, of course, supported at each end of rod 30 as shown in FIG.

According to Figure 5, the bearing support blocks 12 each have incorporated Openings for receiving bearing shafts 20. A bearing and spacer sleeves 18 and 19 are mounted on each shaft 20. These sleeves are of different lengths and are arranged as shown so that the two through a pair of bearings 22, 24 carried by bearing blocks are offset or overlapped with one another while they are · Form a cradle to store the rod. I.e. for each pair of bearings 22, 24 are their respective axes of rotation around a piece arranged at a distance smaller than the diameter of a drawbar bearing. If the bearings are arranged in this way, the rod 30 will be positioned more or less on top of the bearing surfaces, whereby a larger angle of wrap of the web

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can be achieved as would be possible if the rod 30 were cradled in a deeper "V-shaped ¹¹ , formed by the opposing bearings. It can also be pointed out that the bearings 22, 24 on opposite sides of a single Staggered mounting is important by mounting the bearings in a staggered or staggered manner so that each ball bearing of a pair rotates in a different plane, the wear on the rod is not concentrated in one place, which is the pail Bearings 22, 24 and 32 are preferably standardized radial ball bearings with built-in shields or seals to hold the lubricant and keep out dust and dirt. The same bearings can be used in either case will.

The magnets 26 of the permanent type are provided with the rod 30 with shims ^{except for a play of about 0.8 mm (1/32 w).} Magnets can be installed between each pair of load-bearing bearings or between every other pair of load-bearing bearings, as shown in FIG. Other forms of magnetic devices including electromagnets can be used, if desired, to accomplish the same purpose.

In order to produce papers of light weight with a basis weight of 50 engl. Unrolling pounds or less, rod 30 may be on the order of 3/8 of an inch in diameter for best results. For papers with a basis weight between 50 and 120 engl. Pound bars 1/2 inch in diameter are satisfactory. For paper and cardboard over 120 engl. Pound basis weight rods of 5/8 ^w and 3/4 "have been shown to be successful. The spacing between the pairs of load-bearing bearings is not important. For rods of 3/8" and 1/2 ", spacings of 4" should be used adequately. For 3/4 inch rods, 8 inch rods have

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was shown to be satisfactory.

Roll break assemblies can be made in any desired length are used by using a plurality of load-bearing bearings and magnets along with a rigid load-bearing rail 10 stiff enough to avoid undue distraction.

It is contemplated by the device according to the invention arranged alone or in tandem or in pairs reversed with respect to one another (FIG. 6) for the desired purpose be used. In general, the device will be positioned on the machine so that the webs are properly tensioned can when it runs over the unrolling rod. The necessary angle of wrap to induce a given size, can be calculated from the basis weight of the web and the size of the unrolling bar.

A second embodiment of the novel magnetic roll refracting device is shown in FIGS. 7 to 9. During the development of the novel arrangement described At least one prototype of the rotating bar roll breaking device was tried, the hardened one and ground rod in air lubricated bearings. Standard Oilite ball bearings with lubricant removed have been made used, with the first 3/5 of the bearing ground away and a cup shape for the rod that rotated in it, left. An air duct was provided under the bearings and they were clamped in place. The device was then actuated by applying pressurized air through the air duct and the bearings to support the rod. Forehead caps were this is necessary to keep the rod within the cup-shaped bearing when the rod is not in contact with the Paper web stood.

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The device described in FIG. 7 then became a further development of the proposal described above In this case, air-lubricated bronze bearings 4-0 were used instead of the ball bearings according to FIGS. 1 to 5. The usage This air-lubricated bearing 40 in combination with the magnets 26 provides for an operational construction which is functionally equivalent to the device previously described Figures 1 to 5 is. The rigid support structure 10 remains the same, only that it is pierced by an opening 42 is to lubricate the air supply line of the bearings 40 to form. Each lubricated bearing unit comprises a Sasisele-Ment 45 which is fitted in a slot 46 which is machined in the! Carrier device 10 and by bolts 47 or Like. Is attached to the rigid support structure. The base element 45 has air ducts 48 drilled in that way are designed so that they are aligned with cooperating air ducts which are arranged in the support structure 10 are. The air lines 50 are perpendicular to the main feed line 42, which is also attached in the support structure 10. With this arrangement, compressed air can pass through a line 42 can be fed and evenly distributed over the porous bearing 40 via connecting lines 48, 50. The device thus appears to form a film of air on the bearing surface 40 on which the rod 30 can run.

In FIG. 9, means for holding the bearing 40 in its bearing seat are shown. To achieve this requirement is a pair of retaining plates 52 attached to the base member 45 by screw means 54. As the drawing shows, they are Retaining plates 52 each machined so that they fit smoothly to the side edges of the base element 45 and cooperate, however, do not interfere with the rotation of the rod 30. Retaining plates do not hold the rod 30 in the bearing seat because those on each end the storage unit (Figure 7) arranged magnet configurations meet the hold-down requirement. This embodiment has

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has been found to work satisfactorily and useful when a supply of compressed air is readily available was.

Try the magnetic roll breaking device below Use of ball bearings as rolling bearings showed that a mechanical tendency to swell was satisfactorily just above any . Paper type can be eliminated. Of course, for Paper ™ on a light basis, the smaller the diameter, the larger the Be an unrolling bar. Additionally, it can be used for coated Papers considered desirable to use a coated or covered rod to further each Reduce the tendency to scratch the paper surface. For this purpose there is a plastic coated unrolling bar 60 shown in FIG. Any suitable smooth plastic 62 can be used without the retainer graft of the magnet would be disturbed or that excessive friction would be caused. Figure 11 shows an end view the plastic coated or covered bar of Figure 10 and shows the tight fit that the plastic 62 around the Rod 60 occupies.

Another shape the unrolling rod can take is shown in FIG. For this embodiment is one Coil spring 64 shown. In the event that the spring 64 is used, it has been found desirable but not found necessary to use a plastic coating over the nib to prevent scratching the paper. ! Indeed, the magnetic roll refraction arrangement becomes brought into use according to the invention in the form of a curved or a spreading roller; so can that of the coil spring surrounding rod 64 can be used to achieve the correct degree of curvature. However, should be a massive Small diameter rods can be used as well. As stated above, the domed roller is generally

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spend, do a shrinkage in the cross machine direction to reduce a minimum in the manufacture of paper on the machine.

If the magnetic roll breaking device according to the invention in the form of the curved roll described above, it is used to reduce the tendency of the paper to fall into one direction away from machine operation. Another advantage of the curved magnetic Roll breaking device is in the desirable unrolling state of the paper web in the machine direction due to the curvature of the roll.

A schematic representation, like the magnetic roll refraction device according to the invention used as a curved roller is shown in FIGS. 13 and 14. According to this embodiment, the roll break rod be firm if the slope is very slight or a spring-like rod 64 - Figure 12 - can be used, when a greater incline is required. The rod is supported by ball bearing assemblies 22, 24 mounted on Eonsolen 12 is attached similar to the arrangement according to Figures 1-5. Between the ball bearing assemblies are the usual ones Hold-down magnets 26 are provided, these magnets and the brackets 12 are fixed to the support devices 10 in appropriately attached. For the inclined roller installation, the console is supported by adjustable support elements 68 at the base 70. The adjustable bracket is necessary to provide the degree of inclination in the center over the To achieve the desired results, Figure 14 shows in detail a schematic representation of how the adjustable carrier 6Θ can work. The carrier consists of a threaded rod 67 »which is screwed into the carrier element 10. The opposite end of the rod 67 is universal joint-like mounted in the base 070 with a ball member 66. Will

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If the adjustable carrier 68 is rotated, the carrier element 10 including the unrolling device rod 64 moves up and down as desired. Of course, any other suitable device can be used to store the inclined roll, as long as it is adjustable. If a particular fixed slope or bend is satisfactory, a suitable one can be used curved beam 10 can be used.

Claims

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Claims (11)

PATENT CLAIMS 1.) Device for eliminating the rolling tendency of a web, in particular a paper web, with a rigid support device extending across the width of the web; to one thrust bearings located at each end of the rigid support means; a freely rotatably mounted rod made of magnetically attractive material between the thrust bearings; and with one A multiplicity of roller bearing elements which are attached to the carrier devices at spaced-apart locations in order to to store this rod over its length like a cradle or pendulum, characterized by a large number of magnetic, with the support device at spaced locations between the roller bearing elements in the immediate vicinity of this rod connected devices, such that the rod is held in place on the roller bearing elements by magnetic attraction. 2.) Device according to claim 1, characterized in that the roller bearing elements are made up of pairs of on carrier blocks mounted ball bearings exist in such a way that the ball bearings of each pair in planes that are offset from one another, turn around. 3.) Device according to claim 2, characterized in that the ball bearings of each pair are further mounted on the support blocks, with their respective axes of rotation about spaced a piece which is smaller than the diameter of a ball bearing, such that the ball bearings overlap each other and form a V-shaped bearing block make up for that rod. BATH ORIGINAL : s 8 - 9/13 u : 4.) Device according to one of claims 1 to 3, characterized characterized in that the magnet devices have permanent magnets which can be mounted in a hat in the rigid support device are arranged. 5 ·) Device according to tinea of the previous claims, characterized in that the roller bearing elements continue Have Luftgesohmierte bearings, which are attached to a Lagerblook and designed so that they are a bearing seat for form this rod. 6 ·) Device according to claim 5 »characterized in that that these air-lubricated bearings in the longitudinal direction of the rod ' extend and store the rod along its length and have air lines that mate with associated lines in the Rigid f rager device cooperate in such a way that air to Schuler β wake can be led to the storage area near the bar. 7.) Device according to claim 5 or 6, characterized in that the air-lubricated bearings each holding blocks have, which are attached to the bearing block and keep the storage area on their site. 8.) Device according to one of the Torher claims, characterized in that the freely rotatable rod has a plastic cover or a plastic cover. 9.) Device according to one of the Torhergoing claims, characterized in that the freely rotatable rod is formed from a helically wound spring 1st. 10.) Device according to one of the Torher claims, characterized in that the rigid support device is second adjustable on a base element with a variety of b09849 / 1342 BATH ORIGINAL adjustable elements is mounted, which extend between the rigid frägeräusformen and the base element. 11.) Door direction according to claim 10, characterized in that that these adjustable elements each have a universal joint part in the base element and a threaded part, which into an associated threaded opening in the rigid carrier device extends into it so that selectively adjustable elements can be adjusted to accommodate the rigid support means to give the necessary curvature or curvature Χ-Χ-Χ-Χ-Χ Ü98A9 / 13 BAD OBtGlNAL