JPH04226737A - Device to obtain embossing wheel print on flexible material - Google Patents

Abstract

PURPOSE: To prevent pressure which gives damages on a flexible material and bad influences on the characteristics from being applied to the flexible material in an apparatus for applying an embossed foil print to the flexible material. CONSTITUTION: A pressure roller 24 rotates around a shaft 20, and presses a flexible material and an embossed foil by sandwiching them between the roller and a heatable embossing roller 12. A spacer ring 38 is fitted on an eccentric portion 36 around the shaft 20 and the pressure applied to the material is adjusted by adjusting the embossing roller 12 and the pressure roller 24.

Description

[Detailed description of the invention]

0001

FIELD OF THE INVENTION This invention relates to an apparatus for applying embossed foil prints to flexible materials.

0002

BACKGROUND OF THE INVENTION Various devices are known for applying embossed foil prints or decals to flexible webs or materials, such as banknotes. A typical apparatus for applying such an embossed foil print or decal (hereinafter referred to as embossed foil print for simplicity) to a flexible web material is as disclosed in DE 3210551 C2. , a heated embossing roller and at least one support roller or pressure roller, by which the embossing foil and the web material bearing the print to be transferred can be pressed against each other and against the embossing roller. In this configuration, a number of pressure rollers are arranged in pairs on a roller retainer. These pressure rollers can be adjusted individually, but the adjustment procedure is to first place one or two adjacent inner pressure rollers in the appropriate position to mesh with the embossing roller, then adjust the other pressure rollers. are sequentially adjusted in the outward direction with respect to the roller row. However, especially when working with sensitive flexible materials such as banknotes, the equipment
It is inevitable that the fibers of a flexible web material will be damaged by pressure rollers and embossing rollers that press against each other over their entire surface, and compression of such fibers can lead to undesirable changes in the properties of the flexible material. may be caused.

0003

SUMMARY OF THE INVENTION The object of the invention is to provide an apparatus for embossing foil printing on flexible materials, which overcomes the disadvantages of the above-mentioned constructions.

[0004] Another object of the invention is to provide an embossment in a flexible material, which can avoid undesirable compaction of the flexible material and avoid undesirable changes in its material properties even when handling sensitive materials. An object of the present invention is to provide an apparatus for applying foil printing.

Another object of the invention is to provide an apparatus for embossed foil printing on flexible materials, which allows the material to be handled carefully and yet be operated at sufficient speeds.

[0006]

SUMMARY OF THE INVENTION In accordance with the principles of the present invention, the above and other objects are achieved by compressing a heatable embossing roller, an embossing foil and a web of material against each other and against the surface of the embossing roller. at least one pressure roller for precisely adjusting the spacing of the pressure roller relative to the surface of the embossing roller and for precisely adjusting the pressure exerted by the pressure roller on the embossing foil and the material web; This is achieved with a device for embossing foil printing on flexible materials, consisting of adjustment means for one pressure roller.

As explained below, the device according to the invention comprises at least one pressure roller and, depending on the thickness of the flexible material web to be printed and on the thickness of the embossing foil itself. The spacing between the embossing roller and the working surface can be suitably adjusted, so that the embossing pressure between the embossing roller and the at least one pressure roller can be suitably adjusted. In this way, even when embossing sensitive or delicate flexible material webs, such as banknotes, for example, the fibers of the material are subjected to undesired compression that changes their properties and can be damaged. can be prevented. Furthermore, the adjustable structure of the device according to the invention makes it possible to compensate for the effects of temperature changes on the embossing roller, for example the expansion of the roller due to an increase in temperature, so that, for example, the expansion of the embossing roller causes the embossing roller to There is also the advantage that the spacing between the associated pressure rollers does not change.

According to a preferred feature of the device according to the invention, the adjusting device comprises first and second spacers arranged at first and second mutually remote ends of the shaft or axle on which the at least one pressure roller is mounted. rings, the spacer rings being eccentrically mounted on the corresponding shafts or axes. In a preferred feature of the construction, the first and second spacer rings of the pressure roller adjustment means are each mounted on an associated eccentric sleeve fixed to the shaft or axle of the corresponding pressure roller. In that arrangement, a single pressure roller can be mounted on a corresponding shaft or axle, or a plurality of pressure rollers can be arranged on the shaft or axle, preferably spaced apart from each other. The adjustable structure, having at least one adjustment means, allows the at least one adjustment associated with the shaft or axle to be rotated by rotating the shaft or axle, thereby rotating an eccentric sleeve fixed on the shaft or axle. The spacing between the pressure roller and the working surface of the embossing roller can be adjusted very precisely. In that case, the spacer ring associated with the eccentric sleeve can abut the embossing roller at any desired rotational angular position of the shaft or axis.

[0009] Each adjustment means for each pressure roller can have a manually operable adjustment member. In a preferred feature, the manually operated adjustment member is, for example, a rotary knob having a scale that can be associated with fixed marks provided at suitable locations on the device. This adjustment member is thereby operable to change the angular position of the shaft or axis of the corresponding pressure roller in the operative compression position relative to the embossing roller.

Embossing foil prints on flexible material webs, comprising a heatable embossing roller and at least one pressure roller for compressing the embossing foil and the material web against each other and against the surface of the embossing roller. In another structural feature of the applicator, the axial width of each pressure roller is smaller than the axial width of the embossing roller. In that construction, the ratio of the axial width of each pressure roller to the embossing roller may be, for example, from 0.8 to 0.05, or larger or smaller. Particularly when the ratio is small, such a device allows the embossing roller to be relatively wide compared to the width of the flexible material web from which the print is to be transferred from the embossing foil. A virtually constant and uniform temperature distribution is obtained in the area of the pressure roller in the axial direction of the embossing roller, such as between the embossing roller and at least one pressure roller that is relatively narrow compared to the embossing roller. A favorable advantageous effect on the properties is obtained. In such devices, the pressure roller is spaced apart from at least one of the spacer rings, and the device further includes a support roller between the pressure roller and the associated spacer ring, the support roller being more spaced than the pressure roller. It is advantageous to make it slightly smaller. A support roller between the pressure roller and the associated spacer ring prevents the flexible material web from folding to rest on the at least one pressure roller which is relatively narrow relative to the embossing roller as described above. Even if the material web is sensitive and delicate, high operating speeds can be achieved without adverse effects, such as undesired compaction of the material, which can change its properties. The same objective is achieved if the at least one support roller has an axial length that matches the spacing between the pressure roller and the associated spacer ring.

[0011] In another preferred feature of the invention, the pressure rollers, which are spaced from each other and whose axes are arranged parallel to each other, are assembled together to form a respective pressure roller pair. In a device mounted on a rocking arm and arranged in first and second groups symmetrically with respect to the embossing rollers, the supporting rollers are respectively Relevant only to rollers. In each case, the embossing operation takes place only in the area between the embossing roller and at least one pressure roller having a narrow axial width compared to the embossing roller.

Other objects, features and advantages of the invention are illustrated by the following preferred embodiments.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the drawings, number 10 is for applying embossed foil prints or transfer figures to flexible materials, comprising an embossing roller 12, only partially shown in the figure, which can be heated for transfer operations. This shows the device. The device includes, on a base part 14, only a portion of which is shown, rocker arms 16, only one of which is shown in the figure. These rocking arms 16 are 18
It is mounted so that it can rotate around the mounting axis shown in . First and second shafts 20, only one of which is shown, are positioned on their respective rocker arms 16 for rotation about a longitudinal centerline indicated at 22.

Reference numeral 24 designates a pressure roller rotatably mounted on the shaft 20 shown, which pressure roller has a smaller axial dimension, or width, than embossing roller 12. Of course, it is also possible to rotatably mount more than one pressure roller 24 on each respective shaft 20. In that case, the pressure rollers 24 are preferably arranged on their associated shafts 20 at suitable distances from each other. The spacing between individual pressure rollers in such an arrangement can also be adjusted.

These pressure rollers 24 are schematically designated as 2
By means of a known bearing mechanism, indicated at 6, the associated shaft 2
It is attached so that it can rotate upwards. shaft 2
In order to fix the pressure roller in place in the axial direction on , are fixed to the corresponding swinging arms 16. The pressure roller 24 is mounted precisely centered on the associated shaft 20.

The number 30 in the figure represents the eccentric sleeve 30 of the adjustment mechanism 32. Each eccentric sleeve 30 is fixed by a respective pin 34 to one of the mutually distant parts of the shaft 20 shown. Each of the two eccentric sleeves 30 includes an eccentric portion 36 whose wall thickness varies in the circumferential direction, as is clear from the figures, but in particular on the right side of the figures.
This can be best seen by comparing the thickness of the eccentric portion 36 at the upper and lower portions of the end of the shaft 20, respectively. A spacer ring 38 is rotatably mounted on the eccentric portion 36 of each of the two eccentric sleeves 30, and a suitable rotary bearing mechanism 40 is coupled to each spacer ring 38.
and a corresponding eccentric portion 36 with a spacer ring 38 suitably attached thereto.

The two eccentric sleeves 30 associated with the shaft 20 have the same structure and are arranged in the same manner in the circumferential direction of the corresponding shaft 20, ie, the two eccentric sleeves 30 associated with the shaft 20 are
They are arranged in the same row with each other in the direction of the vertical center line 22 of 0.

The two spacer rings 38 supported on the shaft 20 shown are centered about the longitudinal centerline 22 of the shaft 20 because their outer circumferential surfaces 42 contact the working cylindrical surface 44 of the embossing roller 12. The rotational movement causes the spacing between the embossing roller 12, more particularly the working surface 44 thereof, and the working circumferential surface 46 of the associated pressure roller 24 to be adjusted as required, so that the embossing roller 12 and the pressure roller The pressure exerted on the embossing foil (not shown) and the flexible material web (not shown) moving at a suitable operating speed between 24 and 24 can be precisely regulated.

Reference numeral 48 in the figure designates another support roller, shown in thin dashed lines, which can optionally be placed between the respective spacer ring 38 and the pressure roller 24 on the corresponding shaft 20. The support roller 48 has a slightly smaller diameter than the associated pressure roller and the flexible material web is supported on the narrower pressure roller compared to the embossing roller 12 so that the material web is supported on the pressure roller. 24 to prevent it from breaking. It can be seen that the axial length of the support roller 48 is matched to the spacing between the pressure roller 24 and the respective spacer ring 38.

The adjustment mechanism 32 further includes an adjustment member 50 which can be manually operated to set the shaft 20 and thereby the two eccentric sleeves 3.
0 to a suitable angular position about the associated longitudinal centerline 22 and precisely adjust the spacing between the pressure roller 24 and the surface of the embossing roller to thereby transfer the print to the embossing foil and thereby the embossing roller. A suitable pressure can be set between the web of material to be processed and the effect of the precise embossing.

Pressure rollers 24 spaced apart from each other and with their axes parallel to each other are each mounted on the rocker arm 16 and are assembled to form a respective pressure roller pair, embossing rollers 24. In a device arrangement arranged symmetrically in two groups, the support roller 48 is preferably associated only with the outermost pressure roller of the two groups of pressure rollers.

Of course, the above-described apparatus is merely illustrative of the principles of the invention, and various changes and modifications may be made without departing from the spirit and scope of the invention.

[Brief explanation of the drawing]

1 is a partial cross-sectional view of a part of an apparatus according to the invention for embossing foil printing on a flexible material web; FIG.

[Explanation of symbols]

12 Embossing roller 14 Foundation part 16 Shaking arms 20 Shaft 22 Vertical center line 24 Pressure roller 30 Eccentric sleeve 34 pin 38 Spacer ring 48 Support roller 50 Adjustment member

Claims (13)

[Claims] 1. An apparatus for applying embossing foil prints to flexible materials, comprising: a heatable embossing roller; at least one for compressing the embossing foil and the material against each other and against the surface of the embossing roller; one pressure roller, and said at least one pressure roller for precisely adjusting the spacing of the pressure roller relative to the working surface of the embossing roller, thereby precisely adjusting the pressure exerted by the pressure roller on the embossing foil and the material. A device characterized in that it consists of adjustment means for the pressure roller. 2. Further comprising a shaft having first and second ends, the at least one pressure roller being mounted on the shaft between the ends, and the adjustment means comprising: a shaft having first and second ends; 2. The apparatus of claim 1, comprising first and second spacer rings disposed essentially adjacent the first and second ends and eccentrically mounted on the shaft. 3. further comprising eccentric sleeves fixed on the shaft supporting the at least one pressure roller, wherein spacer rings of the adjustment means are each attached to an associated one of the eccentric sleeves;
Claim 2, characterized in that the spacer ring is thereby mounted eccentrically on the shaft.
equipment. 4. The apparatus of claim 1, wherein said adjustment means includes a manually operable adjustment member. 5. An adjustment member, wherein the adjustment means is manually operable to change the angular position of the shaft relative to the embossing roller, thereby changing the position of the pressure roller relative to the embossing roller. 3. The apparatus of claim 2, further comprising: 6. The apparatus of claim 1, wherein the at least one pressure roller has an axial dimension that is smaller than an axial dimension of the embossing roller. 7. The invention further comprises a shaft having first and second ends, the at least one pressure roller being mounted on the shaft, and adjusting means configured to control the first and second ends of the shaft. first and second spacer rings disposed at least essentially adjacent to and eccentrically mounted on the shaft, the pressure roller being spaced apart from at least one of the spacer rings; 7. The apparatus of claim 6 further comprising a support roller between said pressure roller and at least one spacer ring, the diameter of said support roller being slightly smaller than the diameter of said pressure roller. 8. Device according to claim 7, characterized in that the axial length of the at least one support roller at least essentially matches the spacing between the pressure roller and the at least one spacer ring. . 9. A plurality of pressure rollers arranged in first and second groups spaced apart from each other and symmetrical with respect to the embossing rollers, with their axes parallel to each other; comprising respective rocker arms supporting said pressure rollers together forming respective pairs of pressure rollers, each said support roller being associated with a respective outermost pressure roller of said group of pressure rollers; 8. The apparatus of claim 7, characterized in that: 10. Apparatus for applying an embossing foil print to a flexible material web, comprising: a heatable embossing roller and a device for compressing the embossing foil and the material web against each other and against the surface of the embossing roller. at least one pressure roller of
Apparatus characterized in that the axial width of the at least one pressure roller is smaller than the axial width of the embossing roller. 11. The invention further comprises a shaft having first and second ends, the at least one pressure roller being mounted on the shaft, and adjusting means configured to control the first and second ends of the shaft. comprising first and second spacer rings disposed at least essentially adjacent to and eccentrically mounted on said shaft;
The pressure roller is spaced apart from the at least one spacer ring, and further includes a support roller between the pressure roller and the at least one spacer ring, the diameter of the support roller being equal to the diameter of the pressure roller. 11. The device of claim 10, wherein the device is slightly smaller than . 12. Device according to claim 11, characterized in that the axial length of the at least one support roller at least essentially matches the spacing between the pressure roller and the at least one spacer ring. . 13. A plurality of pressure rollers arranged in first and second groups spaced apart from each other and symmetrical with respect to the embossing rollers, with their axes parallel to each other; comprising respective rocker arms supporting said pressure rollers together forming respective pairs of pressure rollers, each said support roller being associated with a respective outermost pressure roller of said group of pressure rollers; 12. The apparatus of claim 11, characterized in that: