JPH11240676A - Flange for roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manually remote an inserted flange from a core by applying pure torque to the frange. SOLUTION: Two helix protruded parts 30 and 31 for example, are formed on a hub part 23 of a flange 20. Hereby, the helix protruded part 30 is arranged on a first helix 32 having a helix angle, and the helix protruded part 31 is arranged on a second helix 33. These helix protruded parts 30 and 31 convert force to apply in the rotational direction to translation of the flange 20 in a direction of an axis 26. Consequently, it is possible to insert the flange 20 into a core 10 by press fitting or screwing. Additionally, it is possible to remove it from the core 10 by applying pure torque around the axis 26, that is, torque without pulling force especially in the direction of the axis 26 to the flange 20. Consequently, it is possible to easily remove the flange 20 in this constitution without breaking the core 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to mounting a flange on a core.

In particular, the invention relates to the attachment of a flange to a core on which a roll of material is wound.

[0003]

BACKGROUND OF THE INVENTION A photosensitive strip material, such as photographic film or paper, a polyester printing plate, or other photosensitive strip material, is wound as a coil on a hollow supporting core, and each end of the core is wound. With a rigid opaque flange and thus light-tight packaging (ligh
By forming a t-tightly packaged roll, it can be packaged in a light-shielding manner. Preferably, the diameter of the flange is larger than the diameter of the wound material. A flexible perimeter cover may be attached to the wrapped strip material, and may cover the wrapped strip material with a few complete turns.
The outer cover preferably has an extra width than the wrapped strip material. The lateral end of the outer peripheral cover is slightly inclined upward and contacts the flange there. In this way, a few turns of coil on the outer cover shield the photosensitive strip material from light. The outer cover does not need to be attached to the flange, and the package has a reliable light blocking effect. Such packaged products are, for example, Agfage Belle N. buoy. (Agfa-Gevaert NV) used for recording film marketed.

As shown in FIG. 1, the flange 20 of such a package comprises a slightly conical hub 23 having an outer rib 24 substantially parallel to the axis 26 of the flange 20. The flange 20 is pressurized into the hollow core 10 and stays attached to the core 10 because the outer diameter of the hub 23, including the ribs 24, is greater than the inner diameter of the core 10. The ribs serve two purposes, one is to keep the flange 20 attached to the core and the other to prevent the flange 20 from turning with respect to the core 10. The latter is required because the roll is driven through the flange 20 with several cooperating devices into which the roll is placed. Normal,
These cooperating devices dispense the photosensitive strip material from the roll.

[0005] However, the attachment of the flange to the core described above raises reliability issues. The attachment is unreliable because of the critical dimensional tolerances between the flange and the core. Impact at shipping, loosening of the core (the core is usually made of cardboard)
The flange may be disengaged from the core due to or by someone lifting on one of the flanges. If the flange comes off, the photosensitive strip material is exposed, thereby wasting the roll.

[0006] French Patent 1,236,361 discloses a connecting part for supporting a roll of strip material, which connecting part will be referred to hereinafter as "flange".
As shown in FIG. 2, the flange has a number of triangular protrusions 25 in the direction of its axis 26, the protrusions being slightly inclined on the side of the center of the roll, Is steeply inclined on the side of the end. In this manner, the flange 20 can be inserted into the hollow cardboard core 10 of the roll, but once installed, cannot be removed from the core without damaging the core. Because of the protrusion 25, the core, and thus the roll, cannot be turned about the flange 20 either.

This mounting solves a reliability problem, which allows the roll to be driven through the flange, but still raises a problem. The flange cannot be easily removed from the roll,
Removal will damage the core.

Usually, such a flange is made of plastic,
For example, it is made of polystyrene. For environmental considerations, it is highly desirable that the flange be easily removed from the roll so that it can be reused or recycled after use.

German Patent No. 7,326,402 discloses a flange which is used, for example, when shipping rolls of woven or carpet material. First, the fabric is wound on a cardboard core. Then, two identical flanges are inserted, but one flange at each end of the core. The rolls are then shipped, but when the rolls are handled by, for example, a forklift truck or other machine, breakage of the rolls is avoided because it can be handled by the flange, and this is the purpose of the flange. is there. The flange is then removed from the core before the roll is placed on the machine on which it will be used, since the core is placed directly on the machine.

3a and 3b show a flange 20 disclosed in this specification, FIG. 3a is a side view partially showing a cross section, and FIG. 3b is a plan view. The flange 20 has a disk portion 21 and a hub portion 23. The hub portion 23 has a thread 30 in the region of the hub close to the disk portion 21.
And the thread has a steep slope (which corresponds to the small angle λ in FIG. 4) so that a very large force is required to pull the flange from the core into which it is inserted. ing. The hub part 2 which is separated from the disk part 21
The third end 27 has a sharp bevel. The disc part has a projecting element 28 or a hole 29.

The flange 20 is connected to the core 10 (FIG. 3) as follows.
a and 3b (not shown). First the chamfered end 27 of the hub portion 23 of the flange is pressed into the core and then the remainder of the hub portion 23 is pressed until the thread starts. Then, the remaining portion of the hub 23, that is, the portion including the thread 30, is screwed into the core using a tool. Since the tool includes a lever, a high torque can be applied.
It has a hole that fits into one of the projecting elements 28 or has a projecting element that fits into the hole 29 of the disc portion 21. The core has no threads and when the flange is screwed into the core, threads are cut or pressed into the core corresponding to the threads 30 of the flange 20.

[0012] To remove the flange from the core, the same tool is used to twist the flange from the core.

This system presents the disadvantage that large forces must be applied to insert the flange into the core and to remove it from the core and require special tools.

[0014]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roll flange that remains reliably attached to the core during shipping, handling and use of the roll.

It is an additional object of the present invention to provide a flange that can be easily removed from the core after use, preferably without breaking the core.

It is another object of the present invention to provide a flange that can be used to drive the roll in a device that cooperates with the roll.

[0017]

The above object is achieved by a method comprising the steps defined in claim 1.

The above object is achieved by a structure having the specific features defined in claim 3.

[0019] Additional advantages and embodiments of the present invention will become apparent from the following detailed description and drawings. Definitions FIG. 4 shows a "helix 32". The vine winding is also known as a thread, and the corkscrew has a vine winding shape. Mathematically defined, the vine winding is a curve on a cylindrical or conical surface, on which the vine winding satisfies the following mathematical relationship: x = r * cos (ωt ); y = r * sin (ωt); z = r * ωt * tan (λ), where r is the radius of the cylinder, ω is a constant, t is a parameter greater than or equal to 0, and λ is the vine winding angle. is there. As shown in FIG. 4, the helix winding angle λ is the angle between the helix winding 32 and a plane perpendicular to the axis 26 of the cylinder, for which the angle is constant. Although not a true vine winding, a special case occurs at λ = 0 degrees, where the vine winding is a circle,
The same is true for λ = 90 degrees, where the vine winding is a straight line parallel to the axis of the cylinder. In the case of a helix on a conical surface, the only difference from a helix on a cylindrical surface is that the radius r is no longer constant. Alternatively, r = c + d * z, where c is a positive constant and d is a constant but can be positive or negative.

"Helical protrusio
n) "is one or more protrusions substantially disposed on the vine winding, and to eliminate the special case described above, the vine winding angle λ is 0.1 degrees <λ <89.9. Degrees or -89.9 degrees <λ <
Limited to -0.1 degrees. The protrusion may be long, for example spanning a complete wrap around the cylinder or cone (with ωt varying from 0 to 360 degrees). Such a helix is actually a thread or part of a thread (see also FIG. 4). The protruding part is short,
For example, it may have a length of a few mm (see also FIG. 5). Each protrusion may have any length from a few millimeters or less to a length corresponding to several turns of the vine winding. 1
To determine if one or more protrusions are located substantially on the vine winding, first the curve S
And the angle σ is as follows:
Is combined with As shown in FIG. 5, curve S is the curve on which the protrusion rests, which is defined as S1 and S2 as the longitudinal curves of the protrusion, the cylinder on which the protrusion rides, or It is defined as the curve on the cylinder or cone lying midway between the curves S1 and S2 that contact the cone. The angle σ of the curve S is defined in the same way as the vine winding angle λ, ie σ is the angle between S and the plane perpendicular to the axis 26 of the cylinder or cone on which S lies. However,
In the case of a vine winding, λ is constant, but σ may vary.

If the difference between λ and σ is less than 10 degrees, the protrusion or protrusions are arranged on a vine winding H having a substantially vine winding angle λ, for example λ =
In the case of 25 degrees, σ may change between 15 degrees and 35 degrees. Further, σ is 0 degrees <σ <90 degrees or −90 degrees <σ <0
Should be degrees.

"Pure torque" is torque without axial pulling or pushing forces, ie, without a force component parallel to axis 26 in FIGS. In another embodiment, removing the flange 20 from the core 10 by "pure torque" applies a torque to the flange first without any axial pull or push, and then applies a small axial force to the flange 20. Applying a pulling or pushing force, "small" means that the force is less than 10 times the weight of the flange 20, preferably less than 5 times the weight of the flange, more preferably It means less than twice the weight of the flange. The causes of this small axial force are as follows. If the core 10 is oriented vertically (as shown in FIG. 7), after the flange 20 is turned from the core by applying an axially forceless torque, the flange 20 10 must still be lifted, which means that a force at least equal to the weight of the flange must be applied. In yet another embodiment, even if "pure torque" is sufficient, the operator may apply the torque and the axial force to the flange 20 simultaneously to attach the flange 20 to the core 1.
It may be removed from 0. As described below, in an embodiment according to the present invention, the flange 20 is
It can be removed from the core 10 by applying a "pure torque", but this axial force is not required, but the operator removing the flange 20 can apply an axial pull or push force. It goes without saying that what is important in the present invention is that the flanges are removed by pure torque, but even if those forces are not necessary for the removal of the flanges, the operator can It goes without saying that another force can be applied to the flange at the same time.

"Manually" removing the flange from the core means that the flange can be removed by an operator directly touching the flange without any use of a tool such as a screwdriver. . In another embodiment, "manually" removing the flange from the core may reduce the torque applied to the flange by the operator by three.
Not higher than 0 Nm, preferably lower than 20 Nm, more preferably lower than 15 Nm, even more preferably 1
Mean below 0 Nm and most preferably below 8 Nm.

"Right-handed screw con
"Vention" is the following convention in mathematics (see also Webster's Third New International Dictioary, published in 1993), i.e., if a given rotation If a rotation in one plane of orientation causes a linear motion perpendicular to that plane, the direction of the linear motion is the right direction with the axis normal to the plane and the given direction of rotation in the resisting medium. The direction of normal movement of the screw along its axis.
Applying n), the flange can be replaced with a right-hand thread and the core can be replaced with a resistive medium into which the screw is inserted. When the flange is removed from the core in a given direction of removal by applying a torque having a given direction of rotation to the flange, a torque having a given direction of rotation when applied to the right hand thread is applied. If the screw is removed from the resisting medium in the same given removal direction, the combination of the given removal direction and the given direction of rotation will depend on the right-hand thread
has a positive sign. If the flange must be replaced with a left-hand thread to generate the same removal direction, the combination of the direction of torque rotation and the removal direction is negative according to the right-hand rule.

The "force efficiency η" of the core and flange structure is η = F _OUT / F _IN where F _IN is the force required to axially press the flange into the core, and F _OUT is the force required to pull the flange axially out of the core. Thus, if η> 1, more force is needed to pull the flange out of the core than to press it into the core.

[0026]

1 to 3 show a prior art flange which has been described extensively. The flange 20 of FIG. 1 is pressed into the core 10 at the first end 11 of the core. The flange 20 has a disc portion 21 and a slightly conical hub portion 23 having an outer rib 24 in the direction of the axis 26 of the flange.
And Such a flange is Agufagever N. buoy. Used to package recording films marketed by (Agfa-Gevaert NV). FIG. 2 shows a flange 20 with a hub portion 23 having a triangular protrusion 25 in the axial direction of the flange, the protrusion being steeply inclined on the side of the disk portion 21 and opposite. The side is slightly inclined. 3a and 3b show a prior art flange having a thread 30 and a chamfered end 27, which must be inserted into a core (not shown) by a special tool.

FIG. 7 shows a schematic view of a roll 80 standing on the floor. Strip material 60 is wrapped around core 10,
An outer peripheral cover 61 is attached to the wound strip material 60 as previously described. A first flange 20 having a disc portion 21 and a hub portion 23 is attached to the core at a first core end 11 and a second flange 40 having a disc portion 41 and a hub portion 43 is attached to the core. Are attached to the core 10 at opposite ends 12. The strip material 60 is packaged light-tight, as previously described.

FIGS. 4 and 5 show a flange 20 according to the invention.
Are shown.

FIG. 4 shows a flange having a disk portion 21 and a hub portion 23. In this embodiment, the flange is hollow and the disk 21 has an inner diameter 22. Two vine-shaped protrusions 30 and 31 are formed on the hub 23. Each of the vine projections is long and continuous, as opposed to the short, individual projections of FIG. The vine-shaped protrusion of FIG. 4 is actually a thread. Vine-shaped protrusion 3
0 is the first helix having a helix angle λ
32 and a vine-shaped protrusion 31 is disposed on a second vine winding 33. The core 10 preferably has a smooth inner surface without protrusions or recesses, and no internal thread is required in the core.

FIG. 5 shows a solid flange 20 having individual protrusions 30 disposed on a helical winding 32. In practice, the individual protrusions may be short threads.

A different embodiment of the cross section of the vine winding is shown in FIG. 6 and will be described later.

4 and 5, the flange can be inserted into the core by press-fitting or screwing and a pure torque around the axis 26, ie the axis The core can be removed from the core by applying a special pull-free torque in the direction of 26. The vine-shaped protrusion projects the torque, ie the force applied in the direction of rotation, in the direction of the axis 26,
This translates into translation of the flange. In the case of individual projections, as shown, for example, in FIG. 5, each individual projection is preferably slightly chamfered in the direction of loosening the screw in order to facilitate removal of the flange in the rotational direction.

In this manner, the flange is easily removed without damaging the core.

On the other hand, a large axial force parallel to the axis 26 is required to pull the flange out of the core. The value of the axial removal force can be found in a later example. Due to the high axial removal force, the flange remains reliably attached to the core during shipping, handling and use of the roll.

FIG. 6 shows an embodiment in which the cross section of the core and the flange inserted in the core are different, but only a part of the helical projection 30 and a part of the core 10 are shown. .
The cross section is obtained by cutting the vine winding and the core in the plane of the meridian, i.e. the plane of the flange 20 passing through the axis 26 of the hub 23. The angle α is the angle between the vine projection on the side of the center of the core and the core, and β is the angle between the vine projection on the end 11 side of the core. The corner between the core. In the preferred embodiment, since the angle α <β, the helical lobe acts as a barb, exerting a large force to pull the flange 20 axially from the core and the flange to the flange. It only requires a small force to press into the core.
In another embodiment, a large force is required to pull the flange 20 axially out of the core 10 because α> β and the vine winding angle λ is very small. In a preferred embodiment, since the force efficiency η> 1, pulling out the flange from the core requires more force than pressing it into the core.

As previously described and shown in FIG. 7, a strip material 60 is wrapped over the core 10. In a preferred embodiment, the strip material 60 is photosensitive. In an even more preferred embodiment, a flexible perimeter cover 61 is attached to the strip material 60 and shields the strip material 60 from light as previously described.

As shown in FIG. 7, the roll 80 is manufactured as follows. The flanges 20 and 40 are pressed into the core 10.
, But in another embodiment the flange is screwed into the core. The strip material is wound on the core. The perimeter cover is attached to the strip material and wrapped over the strip material.

In a preferred embodiment, as shown in FIG. 7, the core 10 is hollow throughout its length. In another embodiment, the core is solid inside and its end 1
With a hollow portion near one, the hub portion 23 of the flange 20 fits into the core 10.

In the preferred embodiment, the flange 20 is hollow throughout its length, as shown in FIG. In another embodiment, shown in FIG. 5, the flange 20 is solid inside. In yet another embodiment, the flange is solid but has a hollow portion on its disk portion 21 side.

A (partially) hollow flange can be more easily driven in a cooperating device, since a driven hub can be inserted into the flange. 2 of the present invention
For a roll with two flanges, if the roll is driven through the flange, the first flange has a helical winding over the clockwise helical winding and the second flange Preferably has a helical winding-like protrusion on the counterclockwise helical winding or vice versa, i.e. if the flange is to be removed from the core by a torque applied on the flange, the first For the flange 20, the combination of the direction of removal of the flange and the direction of rotation of the torque has a positive sign according to the rule of right-hand thread,
On the other hand, for the second flange 40 the combination has a negative sign according to the right-hand thread rule or vice versa. Thus, when driven by the device, the flange is pushed into the core by the torque applied by the drive motor. If both flanges have the same winding helix, one of the flanges will be unscrewed by the motor torque.

In one embodiment of the present invention, hub 23 has two
It has a helix-shaped projection 30 on one or more helix windings. FIG. 5 shows individual short vine-like protrusions located on one vine winding 32. FIG. 4 shows the first vine winding 3
2 shows a first vine winding 30 on the second vine winding 33 and a second vine winding projection 31 on the second vine winding 33. Also, the vine winding protrusion may lie on three or more vine windings. If the hub has helix-shaped protrusions on two or more helix windings, these helix windings preferably have equal or substantially equal helix winding angles.

In another embodiment, the hub 23 comprises a separate, short helical projection, for example, as shown in FIG.
For example, it has a combination with a long helical winding-shaped protrusion as shown in FIG. Combinations of such vine-shaped protrusions may lie on the same vine or 2
More than one vine winding may lie, but the latter may be, for example, a long, continuous vine-like projection on the first vine winding and a separate ridge on the second vine winding. Includes a combination with a short vine winding projection.

In the preferred embodiment, hub 23 has only a long, continuous helical winding over one or more helical windings, actually threads, and hub 23 is short, discrete. No helical winding-shaped protrusion is provided.

Preferably, the pitch of the vine (s) is sufficiently large that a few turns are sufficient to remove the flange from the core. The pitch is the distance between two adjacent cross-sections of the helical ridge, measured in the meridian plane through the axis 26 of the flange 20, but the pitch is determined when the flange is turned only one complete turn. It is also the distance the flange is turned from the core. If the helix is threaded, the pitch of the helix is equal to the pitch of the known thread.

In a preferred embodiment, the pitch is too long compared to the length of the flange, so that no more than two full rotations of the flange are sufficient to remove it from the core.

Preferably, the vine winding angle λ is 2 degrees <λ <
The angle is preferably 85 degrees, more preferably 5 degrees <λ <60.
Degrees, more preferably 5 degrees <λ <45 degrees.
For negative [lambda], preferably 2 degrees <-[lambda] <85 degrees, more preferably 5 degrees <-[lambda] <60 degrees, and still more preferably 5 degrees <-[lambda] <45 degrees. Is good.

In a preferred embodiment, the flange 20 is made of an opaque polymer material. In a more preferred embodiment, the flange is made of opaque polystyrene. The flange may also be made of metal. The core 10 may be made of an opaque polymer material. In a preferred embodiment, the core is made of cardboard. Preferably, the core is made of a material that is more resilient than the material from which the helix projections are made. Preferably, the vine projections are made of the same material as the hub portion of the flange, while the core may be made of another material.

In one embodiment according to the invention, the flange 2
The characteristics of the structure consisting of the core 10 and the
Are manually removed from the core 10. Important properties to enable manual removal are the material properties of both the flange 20 and the core 10, their dimensions and their tolerances. In the examples below, values are given for the properties of the structure of the flange and the core of the invention, which, without intending to limit the invention, also gives the value of the torque required for removing the flange from the core.

For manual removal, the most important properties are the material from which the core 10 and the vine projection on the hub portion 23 of the flange 20 are made, the inner diameter of the core 10, The outer diameter of the hub portion 23 of the flange 20 and the shape, in particular the height, of the vine projection on the hub portion 23. In the embodiment of the present invention, d: the inner diameter of the core, D _max = D + 2 * h: the maximum diameter of the hub portion of the flange including its helical projection, D: the outer diameter of the hub portion of the flange, h: The height of the vine projection (since it is measured in a plane perpendicular to the axis 26, if D _max = d, the hub part with the vine projection will fit exactly into the core ), A flange made of a polymer material and an inner diameter d = 7
For cardboard cores having a thickness of between 2 mm and a thickness between 2 mm and 3 mm, the maximum diameter D _max is greater than the core inner diameter d and the difference D _max -d is not greater than 2 mm, preferably less than 1 mm; More preferably 0.7 mm
It should be smaller and most preferably smaller than 0.5 mm, and if the core diameter d is larger or smaller than 72 mm, the limit value for D _max -d should be changed proportionately, e.g. Diameter d = 144mm
, All limits should be doubled (i.e., from the limit 2 * 2 = 4 mm to the most preferred limit 2 * 0.5 = 1 mm). In the example below, the maximum diameter D _max = 71 + 2 * 0.7 = 72.4 mm, while the core diameter d = 72.0 mm. If the core has a lower elasticity due to the increased thickness of the core or the core is made of a material stronger than the cardboard, then D _max −
The limit for d should be reduced. Also, the limit depends on the exact shape of the vine projection, including angles λ, α and β (see FIG. 6 for some possible shapes). The dimensions of the flange and the core are affected by the many properties of the flange and the core, such as the properties of the material of the flange and the core, their dimensions, and the tolerances of those dimensions, on the manual removability of the flange. A few experiments may be needed to determine.
For a cardboard core having an inside diameter between 60 mm and 80 mm, a good starting value for the largest hub diameter is D _max = d +
0.5 mm. If the torque required to remove the flange is too great for this value, _Dmax should be reduced (or d should be increased). Matachikara F _out or force required to pull out the flange axially from the core, but should be paid to attention that you are in sufficiently large as one likes. If a cardboard core is used, the force F
_{ou t} might vary considerably. Usually, once the material from which the flange and the core are made is selected, no more than three steps are required to determine the dimensions of the flange and core structure of the present invention.
Or four experiments are sufficient.

In the embodiment of the present invention, the outer diameter of the disk portion 21 of the flange 20 is sufficiently large that the flange 20 can be manually removed from the core by turning. Preferably the maximum diameter of the flange 20 is greater than 40 mm, more preferably greater than 50 mm, and even more preferably 6 mm.
It may be greater than 0 mm, while the maximum diameter of the flange 20 always remains less than 200 mm.

Although the embodiments disclosed above are preferred embodiments, the present invention is not limited to these embodiments.

The strip material (60) wrapped around the core (10) need not be photosensitive, but may be, for example, infrared sensitive. Preferably, the strip material (60) is radiation sensitive, such as a photographic or thermographic material.

Preferably, for a roll of photosensitive strip material, the maximum diameter of the flange 20 should be larger than the diameter of the wound strip material 60 and the outer peripheral cover 61. However, the maximum flange diameter may be less than or equal to the diameter of the wrapped strip material, in which case the outer peripheral cover 61 is opposite the outer side of the flange, i.e., the side turned towards the hub portion. It is good to be attached to the side of the disk part.

While hubs having a conical or cylindrical shape are preferred, if inserted into the core by press-fitting or screwing and removed from the core by the application of pure torque, the hub may also have other shapes, for example, slightly hyperbolic May have various shapes.

Preferably, the flange 20 is pressed into the core, but it may be screwed into the core by applying a torque to the flange 20 instead of a pushing force.

In the preferred embodiment, the flange 20 is mounted directly on the core. In another embodiment, the flange 20 may be attached via another component, such as a ring attached to the core at the core end.

In a preferred embodiment, the flange 20 has a hub portion having a disk portion 21 and a helical projection 30. In another embodiment, the flange 20 has a hub portion having a helical projection 30 and, for example, a rim.
m). The rim attaches a disk, or another component, to the core 10.

Preferably, two flanges according to the invention are mounted on the core. In another embodiment, the flange of the present invention may be attached to the first end 11 of the core, and a prior art flange may be attached to the second end 12 of the core. In yet another embodiment, one flange is attached to the first end 11 of the core and the second end 12 of the core may not have any flange.

In a preferred embodiment, the two flanges attached to the core are in accordance with the invention and have a preferred exception for the vine winding angle λ, the first being
Has a clockwise helical winding and a second flange has a counterclockwise helical winding, or vice versa, with the same features as previously described. In another embodiment, the two flanges have different features, the first flange has threads and the second flange has short, separate protrusions, yet another embodiment. In the example, the first
Has a vine winding angle λ = 25 degrees and a second flange has a vine winding angle λ = 40 degrees, and so on.

Preferably, all vine projections on the hub have the same characteristics, in particular a cross-section with the same angles α and β. However, the vine-shaped projections may have cross sections with different characteristics.

The flange of the present invention offers important advantages.

If only the flange is modified, the current roll and core can be used.

The manufacture of the flange is easy.

The core need not have any protrusions, a simple and inexpensive tube, for example of cardboard, suffices. In a preferred embodiment, η> 1, in which case the dimensional tolerance on the core is larger since the flange remains securely attached to the core, which means that less expensive cores can be used. .

The photosensitive strip material on the flanged core of the present invention is packaged in a light-tight manner, and the packaging process can be easily automated.

The flange remains reliably attached to the core during shipping, handling and use of the roll.

The flange can be used to drive the roll in a cooperating device.

Although the flange can be easily removed, it is environmentally advantageous.

The flange can be removed manually. No tools are required to remove the flange. This is convenient for the user.

The removal of the flange is quick. Examples having a re <br/> Bed (, rib) (see FIG. 1) the flange A of the prior art
For B and B and the flange having the above-described features of the invention, we define F _in , the force required to press the flange axially into the core and F _out , the force pulling the flange axially _{out of} the core. And were measured.

The results of these measurements are as shown in the table below:

[0072]

[Table 1] Force was measured on two prior art flanges, (A) and (B). These flanges have the same nominal dimensions, but the forces are different due to the dimensional tolerances of the flange and the core.

With respect to the flange of the present invention, certain features of the flange, particularly the dimensions and angles λ,
With a good choice of α and β, η is greater than 1.

The flange according to the invention used for the measurement is a part of a roll, the roll and the flange having the following characteristics: roll: weight = 100 mm roll length 1 kg, rolled strip material: Diameter = 124mm The storage capacity is HeNe recording film 60m with thickness of 110 micrometers Flange: Material: ABS (acrylonitrile butadiene styrene)
ene styrene) Disc part:-Diameter = 130 mm-Thickness = 3 mm Hub part:-Cylindrical-Diameter = 71 mm-Length = 47 mm Vine winding protrusion: (Material: same material as the flange)-Continuous (= Screw thread)-Projection height = 0.7 mm-λ = 7 degrees 40 minutes-α = about 30 degrees-β = 90 degrees To remove the flange from the core, a torque of 7 Nm is applied to the flange. Was done.

While the preferred embodiment of the invention has been described in detail, many variations may be made therein, but they are now within the scope of the invention as defined in the appended claims. It will be clear to those skilled in the art.

The preferred embodiments of the present invention are as follows.

1. A core (1) having a smooth inner surface is provided with a flange (20) having a helical winding-shaped protrusion (30).
0) mounting said flange (20) into said core (10) for attachment to 0).
The method according to claim 1, characterized in that the inserted flange (20) is manually removable from the core (10) by applying pure torque to the flange (20).

2. A method for attaching a first flange (20) and a second flange (40) to a core (10), said first flange (20) having a helix-shaped protrusion (30). Said second flange (40)
The core (10) has a smooth inner surface, a first end (11) and a second end facing the first end (11). 2 ends (1
2) applying a pure torque to the first flange (20) in a first direction of rotation so that the first flange (20) is in the first position. Inserting the first flange (20) into the core (10) at the first end (11) of the core (10) so that it can be manually removed from the core (10) in the direction of removal of the core (10). And the combination of the first rotation direction and the first removal direction is a right-hand thread rule (co.
and the method also includes applying a pure torque to the second flange (40) in a second direction of rotation. ) Can be manually removed from the core (10) in a second removal direction by attaching the second flange (40) to the core (10) at the second end (12) of the core (10). 10), wherein the combination of the second rotation direction and the second removal direction has a second code according to the rule of right-handed screw, and the second code Is the opposite of the first sign.

3. A core (10) having an inner diameter d, a smooth inner surface, a central portion and an end (11);
A disk portion (21) having an outer diameter of
0) a flange (20) comprising a hub portion (23) for fitting in the hub portion (23), the hub portion (23) having a second outer diameter (D) and a helical winding projection (30); Has,
The vine-shaped protrusion (30) comprises a flange having a height h, wherein the disk portion (2
1) the first outer diameter is greater than 40mm and 200m
m, the inner diameter d of the core (10);
The second outer diameter D of the hub portion (23) and the height h of the helical projection (30) apply pure torque to the flange so that the flange (20) can A structure characterized in that it can be manually removed from (10).

4. A strip of radiation-sensitivity material wrapped around the core (10)
A method of using the structure according to the preceding claim for unwinding ive material.

[Brief description of the drawings]

FIG. 1 shows a prior art flange with ribs.

FIG. 2 shows a prior art flange having a protrusion.

FIG. 3 shows different views of a prior art flange with threads and chamfered ends.

FIG. 4 shows an embodiment of the flange of the present invention.

FIG. 5 shows another embodiment of the flange of the present invention.

FIG. 6 shows an embodiment of a cross section of a vine-shaped protrusion according to the present invention.

FIG. 7 shows a schematic view of a roll with two flanges.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Core 11,12 Core end part 20,40 Flange 21,41 Disc part 22 Inner diameter of disc part 23,43 Hub part 24 Rib 25 Projection 26 Axis 27 Hub end 28 Projection element 29 Hole 30,31 Linear projection 32, 33 Vine winding 60 Strip material 61 Outer cover 80 Roll

Claims (3)

[Claims] 1. A core (10) having a smooth inner surface with a flange (20) having a helical winding projection (30).
The flange (20) for mounting on the core (1).
0) wherein the inserted flange (20) is manually removable from the core (10) by applying pure torque to the flange (20). A method comprising: 2. A method for attaching a first flange (20) and a second flange (40) to a core (10), wherein the first flange (20) has a helix-shaped protrusion (20). 30), the second flange (40) has a helix-shaped protrusion (30), and the core (1)
0) has a smooth inner surface, a first end (11), and a second end (12) opposite said first end (11).
Applying a pure torque to said first flange (20) in a first direction of rotation to cause said first flange (20) to undergo a first removal. Inserting the first flange (20) into the core (10) at the first end (11) of the core (10) so that the first flange (20) can be manually removed from the core (10) in a direction. And the first
The combination of the rotation direction of the first and the first removal direction has a first sign according to the rule of right-hand thread, and the method also includes a second rotation direction on the second flange (40). By applying pure torque to the core (1), the second flange (40) can be manually removed from the core (10) in a second removal direction.
0) inserting said second flange (40) into said core (10) at said second end (12), said second direction of rotation and said second removal. The method of claim 1, wherein the combination with the direction has a second sign according to the rule of right-hand thread, wherein the second sign is opposite to the first sign. 3. A core (10) having an inner diameter d, a smooth inner surface, a central portion and an end (11), a disk portion (21) having a first outer diameter, and said core. (10) a flange (20) having a hub portion (23) for fitting therein.
Having an outer diameter (D) and a helical winding projection (30), the helical winding projection (30) having a flange having a height h. In the body, the first outer diameter of the disc portion (21) is greater than 40 mm and less than 200 mm, and the core (1
0), the second outer diameter D of the hub portion (23), and the height h of the vine projection (30), by applying pure torque to the flange. A structure wherein the flange (20) is adapted to be manually removed from the core (10).