Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work feeding or handling means
Reexamination Certificate
2001-10-24
2004-01-06
Lorengo, J. A. (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With work feeding or handling means
C156S543000, C156S580000, C156S230000, C101S033000, C101S034000, C101S027000, C101S292000, C101S297000, C400S118100, C400S127000, C400S648000, C400S657000
Reexamination Certificate
active
06672357
ABSTRACT:
RELATED PATENTS AND APPLICATIONS
This application claims priority of Japanese Patent Application No. 2000-325206 filed on Oct. 25, 2000 and Japanese Patent Application No. 2000-333689 filed on Oct. 31, 2000, the complete disclosures of which are hereby incorporated by reference.
FIELD OF THE INVENTION
This invention relates to the field of a hot-stamping device for transferring a hot-stamping foil to a value-added medium.
BACKGROUND OF THE INVENTION
An example of a conventional a hot-stamping device for transfer of holographic foil to a value-added medium, such as official documents and the like is the disclosure in International Patent Application WO95/04657. Here, documents becoming hot-stamping objects have a thickness and a width, for example, from single sheets to brochures. In said hot-stamping device, hot-stamping is performed on said documents by the following construction.
A large-size cam structure and a large-size motor are utilized so that a stamping at the load required for a hot-stamping can be effected in a stroke range corresponding to assumed thickness of the documents. Further, the construction is such that pressure greater than a required stamping load is applied, and excess stamping load is absorbed by a spring section built into a bottom stand. Further, a stamping stand and a load cam are arranged in a straight line so that rigidity of the entire device is high enough to withstand a large stamping load.
Hot-stamping device
301
shown in
FIG. 23
is a device for transfer by a pressure application of a hot-stamping foil
303
such as holographic foil and the like to a value-added medium
302
such as tickets and cards of various kinds as well as official documents and the like, drive motor
305
drives cam
306
to rotate, a required load for hot-stamping acts on stamping section
304
to transfer hot-stamping foil
303
to a value-added medium
302
Further, in hot-stamping device
301
, a load acting on stamping section
304
is a predetermined fixed load, uniform hot-stamping is thereby implemented. In hot-stamping device
301
, when motor shaft
308
is locked when stamping section
304
comes in contact with object section
307
through value-added medium
302
and hot-stamping foil
303
, an increase in electric current going through motor
305
is detected, and current through motor
305
is adjusted.
Next, although not a hot-stamping device, a bonding device disclosed in Japanese Laid-open Patent (Kokai) Hei 5-21529 uses a load cell to determine the value of applied pressure in the pressure application section. This value of applied pressure is compared to the predetermined value of applied pressure, and a pressure application section is activated so that the respective values of applied pressure are in agreement.
Nonetheless, in the conventional hot-stamping device, a load required for stamping is adequately obtainable from utilization of a large-size cam structure and large-size motor, but there are problems with such an increase in size of the device, an increase in manufacturing cost, and an increase in product weight.
Further, in a construction wherein an excess stamping load is absorbed by means of a spring section built in a bottom stand, there are cases where documents are bent or creased when there are changes in the position of a face acting as a stamping base. Further, because there is a repeated load application on a hard compression spring, it cannot be said that this a construction with long product life or high reliability. Moreover, because of inertial effect upon movement of the stamping stand, it is difficult to implement a continual stamping at a fixed load.
Further, although positioning a stamping stand and load cam in a straight line is effective from the standpoint of rigidity, there is the problem that the entire device becomes large in size. Further, in a hot-stamping device with a structure having such an arrangement, it becomes necessary to set the holographic foil by, as it were, stitching the various structural parts together; therefore, there is the problem that an exchange of holographic foil can only be done by skilled persons or professional service providers.
The pressure necessary for the transfer of a hot-stamping foil (for example, holographic foil and the like) varies with the kind of hot-stamping foil, further, permissible applied pressure varies with the kind of value-added medium (for example, ticket paper and plastic cards and the like) comprising the stamping object. In other words, the most suitable applied pressure that can transfer hot-stamping foil in satisfactory fashion, and which does not damage value-added medium, varies with the kind of hot-stamping foil and value-added medium.
However, in a hot-stamping device shown in
FIG. 23
, there is no way to control the application of stamping pressure appropriately, in response to the kind of hot-stamping foil and the kind of a value-added medium. In hot-stamping device
301
shown in
FIG. 23
, the relationship between the electric current in motor
305
and the load acting on stamping section
304
is not known, consequently, it is difficult to control application of stamping pressure accurately.
Therefore, as in a bonding device disclosed in Japanese Laid-open Patent (Kokai) Hei 5-21529, one thought is to use a load cell to measure the pressure-exerting load of the stamping section, compare this pressure-exerting load and the required fixed load, and operate the stamping section so the pressure-exerting load matches the fixed load, but when this control is utilized in the hot-stamping device without modification, the following problems are present.
In other words, when a stamping section is used in the one hot-stamping device constitutes a multiplicity of stamping sections with various respective sizes or when there is engraving on the stamping face, the area of the part in the stamping section that comes in contact with the value-added medium at the time of hot-stamping (hereinafter, termed stamping area in this specification) varies. Because of this, even when a fixed load is activated, the load generated per unit area in the stamping section at time of hot-stamping, in other words, pressure (hereinafter, termed stamping pressure in this specification) is not constant. In other words, even when a fixed load is activated, the stamping pressure is small in a stamping section with a large stamping area, the stamping pressure is large in stamping section with a small stamping area, so uniform hot-stamping cannot be implemented. Because of this, stamping pressure is weak and satisfactory transfer of hot-stamping foil does not occur. Alternatively, stamping pressure is too strong so there is concern of damage to the value-added medium and stamping section.
SUMMARY OF THE INVENTION
Therefore, this invention provides a hot-stamping device which, although small in size, is able to perform hot-stamping at a high speed and moreover in a satisfactory fashion at a stamping load adequate for a value-added medium having a thickness and width, furthermore, exchange of hot-stamping foil is performed easily.
Further, this invention provides a hot-stamping device and a stamping pressure control method for a hot-stamping device wherein regardless of how big or how small the size of the stamping section or the shape of stamping face, etc., uniform hot-stamping can be performed at an optimal stamping pressure.
To achieve the above, a hot-stamping device described has a stamping arm with one end being a free end, and stamping section positioned at said free end that applies pressure to a hot-stamping foil and a value-added medium to transfer a hot-stamping foil to a value-added medium, and a first cam in contact with a stamping arm to move a stamping section to close proximity of value-added medium, and a first drive section driving said the first cam, and a second cam bringing pressure-exerting load to bear on a stamping section moved to close proximity of the value-added medium, and a second drive section driving the second cam.
Consequently, a high-speed cam, in other w
Komatsu Fumito
Kuroiwa Yukio
Takasawa Kiyotsugu
Yokozawa Mitsuo
Lorengo J. A.
Reed Smith LLP
Sankyo Seiki Mfg. Co. Ltd.
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