JP3664912B2 - Apparatus for embossing foil, method for using the apparatus, method for manufacturing the apparatus, and method for operating the apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for embossing a foil. This device comprises the same kind of teeth and is connected to a drive means and comprises a set of commonly driven rollers which press against each other in an elastic manner. The invention also relates to a method of operating an apparatus for embossing a foil.
[0002]
[Prior art]
The device comprises a set of rollers having the same type of teeth engaging each other during operation. This type of device is described in detail in US Pat. No. 5,007,271. The problem underlying this known embossing device is that although the teeth of the roller are machined with relatively high accuracy, the embossing is of high quality and only one of the rollers is driven, The embossing rollers are synchronized with each other when the rollers are driven. In order to ensure the life required for the rollers, it is difficult to satisfy these requirements if the two rollers are provided with hardened teeth, respectively.
[0003]
To meet the mutual synchronization requirements of the embossing rollers, the circumferential rows of teeth on both rollers are aligned with each other so that the tooth flank is in meshing area of the two rollers And the idle roller is forcibly driven by the drive roller.
[0004]
The arrangement described above or the mutual alignment of the embossing rollers is suitable for implementation as long as the foil that can be embossed, in particular the packing foil, is a foil made primarily of aluminum. However, today, the use of paper foils is increasing and desired. It is clear that this foil is substantially stiffer than the aluminum foil and no longer meets the requirements with known embossing rollers.
[0005]
[Problems to be solved by the invention]
It is an object of the present invention to provide a device that meets new requirements, i.e. a device that can optimally emboss any type of foil.
[0006]
[Means for Solving the Problems]
According to the invention, this object comprises a set of rollers with the same kind of teeth with pyramid-shaped teeth, the first roller being connected to the drive means and the second roller being engaged by the teeth of the rollers. In the apparatus for embossing the foil, the pair of rollers are driven in common, and the pair of rollers press against each other in an elastic manner . 2 rollers, the circumferential direction with respect to the first roller can move in the radial and axial directions, whereby, in order to enable self-stabilizing operation, the teeth of the rollers can move mutually in a predetermined engagement position This is achieved by the device comprising an operating stage, in which each tooth of each roller is symmetrically surrounded between the four teeth of the other roller.
[0007]
The invention also relates to a method of using the device of the invention for embossing mainly paper-like foil and a method for producing an embossing roller that is eroded after the teeth are formed.
[0008]
As described above, in the predetermined engagement position between the tooth portions of the roller, which is a feature of the present invention, not only the mutually stable driving and the rotation of the synchronized roller are ensured, The optimum embossing is ensured regardless of the material that can be embossed. Furthermore, the present invention provides a method of operating an apparatus for embossing a foil with a set of embossing rollers that have the same type of teeth and that engage each other during operation. And in this position, each tooth in the contact area of each roller is surrounded at least approximately symmetrically between the four teeth of the other roller.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the following, the invention will be described in detail on the basis of advantageous embodiments.
[0010]
For the basic structure of the embossing apparatus, reference is made to that described in the above-mentioned US Pat. No. 5,007,271. The foil band is passed between two embossing rollers with teeth. One of the rollers is fixed and driven. The other roller is rotatably attached to the shaft and is pressed against the drive roller with pressure adjustable by elasticity, air, or other means.
[0011]
The same kind of tooth portion is provided on the surface of both embossing rollers, and FIG. 1 shows the tooth portion in a schematic development view. This tooth part consists of a plurality of pyramidal teeth, and these teeth are arranged in a row in the circumferential direction and in the axial direction perpendicular to the circumferential direction. As mentioned above, FIG. 1 is a schematic diagram. That is, the teeth are shown as if they had a pyramid-like exact geometry with a pointed tip. This is the same as that of the above-described prior art embodiment.
[0012]
The novel feature of the present invention is that the tip of the tooth is flattened as shown in FIGS. That is, the teeth are shortened by ΔA (FIG. 3). The actual value of ΔA is at least 2%, preferably 5-25% of the tooth height in the theoretical geometry. In addition, the edge of the pyramid or conical pyramid shape is cut. The cutting is obtained by performing a general finish erosion treatment, for example, etching or galvanic erosion mainly acting on the edge portion after the tooth portion is processed.
[0013]
Another difference of the present invention compared to the well-known embodiment in which the axial positions of the embossing rollers are determined in advance is as follows. In order to be movable, the rollers can move relative to each other with relative axial play of at least half the tooth pitch, preferably 3/4 of the tooth pitch.
[0014]
By starting the device, first the embossing rollers are respectively joined with the foil bands inserted between them and operated against each other, and are shown in FIGS. 2 and 3 in the contact area of the rollers. The relative position of the teeth almost occurs. FIG. 2 shows the relative positional relationship of the teeth in the circumferential direction, and FIG. 3 shows the relative positional relationship of the teeth in the axial direction. As shown in FIG. 3, the tooth flank contacts each other, resulting in an interaction height E _H1 .
[0015]
Since the embossing roller rotates, the rollers easily move relative to each other in the axial direction. If the two roller teeth flank completely mesh with each other, the rollers or their teeth will penetrate deeper, resulting in a smaller working height E _H2 . The relative positions of the teeth are shown in FIGS. 4 and 5, FIG. 4 shows the relative positional relationship of the teeth in the circumferential direction, and FIG. 5 shows the relative positional relationship of the teeth in the axial direction. Each tooth is symmetrically surrounded and engaged by the four teeth of the other roller. That is, the teeth are engaged so as to contact each other along the edges of the teeth. Also, since the tooth edge is cut and its tip is flattened, the experience shows that the tooth is positioned in a deeper engagement position that is stable and does not detach. Be captured. Accordingly, the tooth portion itself is dynamically stabilized at a certain position. As shown in FIG. 6, this self-stabilizing effect is facilitated by the foil pressed between the embossing rollers.
[0016]
At any engagement position of the two embossing rollers, the material that can be embossed is pressed around the structural edges K1, K2. This creates a tension on the paper, which creates forces F1 and F2 on the idle roller. As a result, the embossing roller is moved from the unstable position of FIG. 6 to the stable position of the maximum intrusion of FIGS. 4 and 5. As described above, considerable force is required to move the rollers from mutually stable positions that have entered the maximum in the axial direction or circumferential direction. Therefore, a safe and stable drive of the idle roller is obtained by the positions of the teeth that are in contact with each other in the corresponding engagement area. At the same time, an optimum embossing, in particular an optimum embossing of the paper foil, is obtained. Also, at the initial position of engagement, the teeth contact with their axial flank. In this case, a stable engagement position is obtained by relative movement in the circumferential direction.
[0017]
7 and 8 schematically illustrate the embossing process in comparison with the engagement position of the present invention (FIG. 7) and a conventional tooth position (FIG. 8). In both figures, the tip of the tooth of one roller is indicated by a triangle, and the tip of the tooth of the other roller is indicated by a circle. The dotted line is the associated break line, and the embossed length at the tooth position of the present invention is longer than that at the conventional position, and the foil nerve not only occurs under tension, but also diagonally. It also occurs in the direction.
[0018]
However, certain minimum conditions must be met for reliable operation. In the embossing process of the present invention of FIG. 7, the metal paper provides dynamic compensation for the constant pitch difference ΔT of the two embossing rollers due to its elasticity. In other words, the embossing of the present invention is no longer possible if the pitch difference ΔT is greater than a certain self-centering factor. In any case, if self-centering or self-synchronization cannot be ensured, the embossing pattern is broken. The relevant conditions are shown below.
[0019]
T1 is the radial pitch of the first roller.
[0020]
T2 is the radial pitch of the second roller.
[0021]
ΔT is a pitch difference.
[0022]
T _HT is a theoretical radial pitch (reference pitch).
[0023]
S _ZF is a self-centering factor.
[0024]
E _F is a factor which is determined by the rule of thumb, is 98.75.
S _ZF = T _HT / E _F , ΔT = T 1 −T 2, S _ZF ≧ | ΔT |
A numerical example
T1 is 0.402,
T2 is 0.399,
When T _HT is 0.400,
ΔT is 0.402−0.399 = 0.003,
Since S _ZF is 0.400 / 98.75 = 0.405,
0.00405 ≧ 0.003.
[0025]
This means that the effect of self-centering can be secured. All the above dimensions are in mm.
[0026]
The advantageous embodiments described above result in simplification, reliability and long life of the rollers, as well as high quality embossing and easy operation regardless of the foil material. This embodiment has the advantage that the tooth portion can be moved to a stable mutual position by using the tooth shape described above. However, this is possible in other embodiments.
[0027]
The rollers can also be provided with teeth of different heights or the same height. That is, the pitch must be matched, but the amount of the flat portion can be changed. When the teeth have different heights, it is preferable to provide lower teeth on the idle roller, i.e. the driven roller. This is because it receives a slightly larger friction but is easier to replace than the drive roller.
[0028]
Also, the rollers are provided with means for pre- or post-position adjustment, for example, the edges or sides of the rollers that are engaged with each other at start-up, so that the above means are accurate. Engagement and subsequent movement of the roller to a stable position. This means must have sufficient play to allow free movement of the rollers to a stable position.
[0029]
When a stable position of engagement is obtained, the rollers can be locked at each other position, thus eliminating any danger of popping the roller from the stable position to a different position. For example, when a stable position is obtained, the axial position of the idle roller can be locked by clamping the axially movable roller shaft, and a previously released gear without play is connected between the two rollers. The
[0030]
Finally, the rollers are also positioned relative to one another by a gear without play or at a position where mutual engagement is preset at the beginning as in the present invention.
[Brief description of the drawings]
FIG. 1 is a schematic development view of teeth of an embossing roller. FIG. 2 is a diagram showing engagement positions of teeth of an embossing roller when the device is started. FIG. 3 is an embossing when the device is started. FIG. 4 is a diagram showing a stable engagement position of a tooth portion of an embossing roller. FIG. 5 is a diagram showing a stability of a tooth portion of an embossing roller. FIG. 6 is a diagram showing the supply of foil that affects the self-stabilization of the mutual position of the rollers. FIG. 7 is a schematic diagram showing the stable mutual position of the teeth of the roller of the present invention. [Figure 8] Figure corresponding to the stable mutual position of the rollers [Explanation of symbols]
ΔA Values of the flat portion with respect to the height in the theoretical geometric shape T1, T2 Radial pitch of the roller

Claims (12)

A pair of rollers having the same type of teeth having pyramid-shaped teeth is provided, and the first roller is connected to the driving means, and the second roller is driven by the engagement of the teeth of the roller. In an apparatus for embossing a foil, in which a set of rollers is driven in common and the set of rollers press against each other in an elastic manner,
The second roller of said pair of rollers, the peripheral direction relative to the first roller can move in the radial and axial directions, thereby, to allow the self-stabilizing operation, the teeth of the rollers of a given Embossing foil, characterized in that it has an operating stage which can be moved relative to one another in an engagement position, in which each tooth of each roller is symmetrically surrounded by four teeth of the other roller Device to do.   The apparatus for embossing a foil according to claim 1, wherein the set of rollers enter each other at a maximum penetration depth in mutually stable positions.   The apparatus for embossing a foil according to claim 1, wherein the tip of the tooth is flat. 4. The apparatus for embossing a foil according to claim 3, wherein an edge portion of the tooth is cut. 4. A device for embossing a foil according to claim 3 , characterized in that the amount to be flattened is at least 2% of the height of the teeth, preferably between 5% and 25%.   The apparatus for embossing a foil according to claim 1, wherein the pair of rollers comprises teeth of different heights and the second roller comprises teeth of low height.   Use of an apparatus for embossing a foil according to claim 1 for embossing mainly paper-like foil.   The roller manufacturing method for an apparatus for embossing a foil according to claim 1, wherein the erosion treatment is performed after the tooth portion is formed. 9. The method according to claim 8 , wherein the erosion treatment is performed by etching, galvanic erosion or other similar methods. In the operation method of the apparatus that embosses the foil with a set of embossing rollers that are provided with the same type of tooth part and engage with each other at the time of operation,
During successive steady operations, a set of rollers is operated in mutual position, in which each tooth in the contact area of each roller is surrounded at least approximately symmetrically between the four teeth of the other roller. A method of operating an apparatus for embossing a foil characterized by Said set of rollers, is rotated during at least the start, claim entrained in order to obtain a mutually predetermined engagement position with stability roller, during continuous operation, characterized in that remain in that position 10 Method of operating an apparatus for embossing the described foil. After a stable engagement position is obtained, said roller, claim by eliminating mutual play in the axial direction and or circumferential direction on the roller, characterized in that it is locked in this mutual position 11 Method of operating an apparatus for embossing the described foil.

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