WO1992002362A1

WO1992002362A1 - Roll

Info

Publication number: WO1992002362A1
Application number: PCT/DK1991/000207
Authority: WO
Inventors: Morten Kristensen
Original assignee: Morten Kristensen
Priority date: 1990-07-31
Filing date: 1991-07-16
Publication date: 1992-02-20
Also published as: AU8321191A; DK165495C; DK183190A; DK165495B; DK183190D0

Abstract

Rotatable roll comprising an inner tube (1) and preferably an outer tube (2), being arranged in parallel and coaxially with the inner tube, at least two generally radial end plates or intermediate plates (8, 11) being placed between these tubes, said outer tube (2) comprising a fixed tubular shell (3) and a movable tubular shell (4), the curved surfaces of which are of approximately equal size, said movable tubular shell (4) being pivotable round a spear (5), which is connected with the fixed tubular shell and preferably follows a course in parallel with the longitudinal axis of the roll, so that the outer tube (2) is openable and closable along a surface of cut (6), preferably in the longitudinal direction of the roll, the roll further comprising a control system for the opening and closing of the outer tube. The roll is used in the manufacture of hollow objects, especially packing containers, of cardboard and the like, and it makes release of the object from the roll following the manufacture much easier. The roll can also be used, when securing and centering objects in general. A control system comprising two fixed beams (15, 16) and an intermediate beam (17), being connected with the fixed beams by means of chain links (22, 23), is preferred. During the manufacture of machining of the object, the outer tube is locked in a position, in which a slight slit is established between the two tubular shells, and when the object is to be released from the roll, the shells are pushed closer together via an actuation of the intermediate beam, the chain links thereby promoting a pulling together of the two tubular shells.

Description

Roll The invention relates to a roll of the type mentioned in the preamble of claim 1.

Such rolls are generally used in the manufacture of hollow objects or wor pieces from paper, cardboard, textile fa¬ bric, plastics and the like; a length of a suitable mate¬ rial being passed through a solution of an adhesive and wound round the roll, until an adequate layer is obtained, for instance 5-50 mm, whereupon the packing object is pulled off the roll, so that the manufacture of the follow¬ ing object can begin. In this way packing containers can be manufactured, for instance in the shape of packing cases or packing drums or cylinders, even conical objects or ob¬ jects having in the axial direction a variable cross sec- tion, simply using a roll comprising an outer body having an edged or circular cross section, respectively. Using such rolls, for instance so-called "fibre barrels" can be manufactured from paper, as well as suitcases and parts of sofas. In the description below the outer body - for the sake of clearness - is referred to as a tube, the object now and then being referred to as cylindrical.

To manufacture a strong and uniform object, the length of the appropriate material must be wound relatively tightly round the roll, this fact rendering the final removal of the object from the roll difficult.

According to the known art this problem is solved by pro¬ viding the outer tube of the roll with a flap, which is to be opened inwardly when the object is to be pulled off the roll, cfr. NO patent no. 9332. Having opened the flap, the object being wound round the roll has to be pressed in¬ to the opening or gap thus formed to release it across the edge, being formed where the flap is opened, and subse- quently the operative has to release the object all the way round the roll by pressing, pulling and pushing with his nails in preparation for the final complete release of the object from the roll. This operation is extremely dif¬ ficult, exhausting and elaborate and often the objects are considerably damaged during the pressing into the opening. Besides, this step has been the cause of the whole process not yet being fully automatized, despite this being highly desirable.

These disadvantages are eliminated when using a roll as disclosed in the characterizing portion of claim 1. If so desired, the surface of the cut, being generally oriented in the longitudinal direction of the roll, may follow an inclined or undulating course, according to the actual ap¬ plication.

The roll according to the invention is used as follows: When winding for instance a length of paper round the roll, the outer tube of the roll is not completely closed, the circumference, however, being perfectly circular. During the winding or spooling, the paper is secured to the roll only by virtue of constriction. Having finished the winding operation, the tubular shells are pushed more close together, thereby making the wound material slip the roll all the way round the pivotable outer tubular shell cove¬ ring generally half the curved surface (180°) of the outer tube. After this, the packing object can be removed from the roll in a quick pull. The wound object slides off smoothly by itself, and the tightening or constriction is eliminated. The complete release and removal of the object is quite easy and simple. In practice, after being released by pushing together the tubular shells, even a wound tubular object having a very thick wall is easy to remove using only one finger.

Using the roll according to NO patent no. 9332 in prac- tice, it is impossible to make the material slip even approximately 180° round the curved tubular surface. suppose the two tubular shells were actually of appro¬ ximately the same size, then partly the wall thickness of the outer tube restricts the moving towards each other of the tubular shells, and partly the material will actually, c the movable shell covering from the pivot centre to the surface of cut for instance 150°, slip the roll along per¬ haps just 50°, because it has to be pressed free across the pointed edge or flat of cut, thereby being brought in touching engagement with the movable tubular shell, when a

^■]__Q piece of the object corresponding to a much shorter distance than the distance corresponding to the whole curved surface of the movable shell has slipped the roll. Furthermore, in order to resist the tightening and the con¬ striction during the winding operation, it is in practice

15 impossible to manufacture a roll according to NO pa¬ tent no. 9332 having a flap covering more than 90°.

In the characterizing portion of claim 2, a specially ad¬ vantageous embodiment of the roll according to the in-

2o vention is disclosed, in which at least two of the end- or the intermediate plates of the roll are divided cor¬ responding to the movable outer tubular shell, i.e. gene¬ rally diametrally, these plates functioning as seat of the spear and the control or guide system for the opening and 5 closing of the outer tube.

The control system can be worked out in many ways being obvious to the man skilled in the art. What is necessary is a connecting means between the two tubular shells, said

30 means partly providing a stop function corresponding to the desired maximum slit between the two tubular shells, and partly being πctunblo in oπl r lo displace* t:l)-' two tu¬ bular shells against each other or awny from each other. The control system is suitably placed in connection with

35 the end plates and the intermediate plates, cfr. claim 2.

In claim 3, a particularly simple and well functioning con- trol system is disclosed, comprising two generally axially placed beams being secured to one part each of the divided end plates and intermediate plates, and a similar beam be¬ ing placed between these two beams, the beams being trans- versely connected by movable connective joints or links at suitable axial distances. By the movement of these connec¬ tive links, the mutual distance between the beams will change, the outer tube of the roll in that way being opened or closed. Many different types of connective links will be found applicable by the man skilled in the art, for instance spring links, hinged joints, pivot joints, chain links and jaw-tongs joints.

When applying the simple control system described above, the connective joints being preferably placed opposite the intermediate plates and one of the end plates, the roil can be manufactured from a very thin material, and still posess an enormous strength. No wry actuations occur during the opening and closing process, which wry actuations might lead to a certain clearance in the system.

Especially preferred is the embodiment disclosed in claim 4, in which the two fixed beams are arranged in parallel and attached to the divided end- or intermediate plates by means of further spears, and in which the means connecting these beams to the intermediate beam comprises two chain links, if desired more than one set of chain links arranged in parallel. This jaw-tongs mechanism is a supporting or principal unit securing in this embodiment of the roll the parallellity of the system. When the fixed beams are secured by means of spears, the whole system is easy to exchange, if, for instance, a system having another tolerance (width of the slit) is desired; and when using chain links, a simple and well functioning mutual dis- placement of the beams is obtained. For the chain links are not, when their three points of attachment align, even when using a great display of energy, displaceable towards each other or away from each other, but as soon as for in¬ stance the intermediate point of attachment is displaced slightly away from the straight line between the two other points of attachment, the whole construction can make a scissors movement, thus pushing the beams towards each other or away from each other, corresponding to a closing and an opening, respectively, of the outer tube of the roll.

When using the roll according to the invention for the manufacture of for instance fibre barrels, it is very im¬ portant to keep the width of the slit between the two tu¬ bular shells constant during the winding up of the mate¬ rial, because the outer tube of the roll during the winding up must be slightly open, while being closed during the release of the barrel from the roll. The above described principle might easily be changed into a better, self-lock¬ ing control system by mechanically preventing the interme¬ diate beam from being displaced more than a certain di- stance to the one side, for instance by means of a blocking beam placed in such a distance, that the intermediate point of attachment is displaced 0,1 mm to the left, as compared to the straight line between the two other attachment points. Under these circumstances, the width of the slit remains quite constant, until the intermediate beam final¬ ly, manually or automatically, is pulled to the right.

The distance between the beams, being a function of the length of the connective links, is preferably chosen so as to obtain a certain desired distance, for instance 2 mm, between the two shells of the outer tube, when the connec¬ tive joints are in their not actuated position (the chain links aligning, the intermediate point eventually slightly displaced from the straight line, cfr. the discussion above), while the two tubular shells generally mutually abut along the surface of cut, when the connective joints are in their actuated position (the chain links angularly bended ) , cfr . claim 5 .

The displacement of the . intermediate beam, i.e. the bringing into not-alignment of the chain links and the closing of the slit, can be effected manually or automa¬ tically, for instance using compressed air or a plunger ram (hydraulic piston) acting on the intermediate beam.

The roll of the invention is applicable industrially for many other purposes than the above mentioned, for instance for securing and/or centering hollow objects in connection with a machining thereof.

In the following more detailled description of a preferred embodiment of the roll according to the invention, re¬ ference is made to the drawing, in which fig. 1 is a perspective view of a roll according to the invention, without control system; fig. 2 an end view of a preferred embodiment of the roll with a control system, and fig. 3 a detail view of the beams and the connective links in the control system of fig. 2, seen from above.

The roll depicted in fig. 1 and 2 comprises an inner tube 1 and an outer tube 2 being arranged in parallel and coaxial- ly herewith. By means of end plates 8 and eventually inter¬ mediate plates 11 at suitable distances along the longitu¬ dinal direction of the roll, these two tubes are fixed in their relative position, the said distance depending among other things on the length of the roll and the rigidity of the tubes. The outer tube is divided into two tubular shells, along an axial surface or flat of cut 6, viz. a socalled fixed tubular shell 3, being connected with the inner tube, and a movable tubular shell 4, being pivotable around a spear 5, which runs in the axial direction and is connected with the fixed tubular shell, preferably by means of end plates 8 and/or intermediate plates 11. The end- and intermediate plates are divided corresponding to the divi¬ sion of the outer tube into a fixed portion 9, being attached, for instance welded, to the fixed tubular shell 3, and a portion 10, being attached to the movable tubular shell 4. Cutouts in these end- and intermediate plate portions constitute a seat for the opening/closing control system, said system being for instance worked out as shown in fig. 2 and 3. In these figures, two beams 15, 16 are shown, being secured by means of spears 20, 21 to the fixed and the movable tubular shell, respectively, via the end- and intermediate plates; and an intermediate beam 17, being connected with the two fixed beams by means of connective joints 18, preferably chain links 22, 23, eventually more than one set of chain links 22, 22'; 23, 23', arranged in parallel.

Claims

C L A I M S

1. A roll for the manufacture or machining of hollow ob¬ jects, said roll comprising an inner tube (1) and an outer body, preferably an outer tube (2), being arranged in parallel and coaxially with the inner tube, at least two generally radial end plates or intermediate plates (8, 11) being placed between the inner and outer tube, said roll being rotatable, said outer tube (2) comprising a fixed tu- bular shell (3) and a movable tubular shell (4), being pi- votable round a spear (5), which is connected to the fixed tubular shell (3), and which preferably follows a course in parallel to the longitudinal axis of the roll, said outer tube being openable and closeable along a surface or flat of cut (6) extended preferably in the longitudinal direction of the roll, a control system being connected with the roll to control the opening and closing of the outer tube, c h a r a c t e r i z e d in, that the curved surfaces of the two tubular shells (3, 4; are approximate- ly of equal size, the longitudinal axis of the spear (5) and the surface of cut (6) of the fixed tubular shell together defining a generally diametral plane. (7).

2. A roll according to claim 1, c h a r a c t e r i z e d in, that at least two end plates (8) or intermediate pla¬ tes (11) by means of a cut corresponding to the movable tubular shell, i.e. generally diametrally, are divided into two portions (9, 10) being connected with the fixed (3) and the movable (4) tubular shell, respectively, these por- tions (9, 10) establishing a seat for the spear (5) and for the control system.

3. Λ roll according to claims 1-2, c h a r a c t e¬ r i z e d in, that the control system for the opening and closing of the outer tube comprises two beams (15, 16), being mainly extended in the longitudinal direction of the roll and being connected with one portion (9, 10) each of the divided plates (8, 11), and at least one further beam (17) being placed between the two beams, these beams at appropriate axial distances being mutually transversely connected via movable connective links (18), so that the respective distances between the beams, by the activation of these movable links (18), can be changed, thereby making the movable tubular shell (4) move away from or approach the fixed tubular shell (3), the roll thereby opening or closing.

4. A roll according to claim 3, c h a r a c t e r i z e d in, that the control system comprises three beams arranged in parallel, the two outer beams (15, 16) at appropriate axial distances being attached to a further spear (20, 21) each via the portions (9, 10) of the end-and/or intermedi¬ ate plates, being thereby fixedly connected to a tubular shell (3, 4) each, the intermediate third beam (17) at appropriate axial distances being movably connected with the two fixed beams (15, 16) by means of two chain links ((22, 23), preferably two sets of chain links (22, 22'; 23, 23').

5. A roll according to claims 3-4, c h a r a c t e¬ r i z e d in, that the tubular shells (3, 4) are placed at a certain desired mutual distance, when the connective links (18; 22-23) are not-actuated or in a self-locked po¬ sition, preferably being aligned or generally aligned, the beams being correspondingly positioned; whereas the tubu¬ lar shells approximately abut along the surface of cut (6), when the connective links are in a not-self- -locked, actuated position, preferably angularly bended.

6. A roll according to claims 1-5, c h a r a c t e¬ r i z e d in, that it is used for the manufacture of hollow objects from textile, cardboard, paper, plastics and the like materials.