Printing – Bed-and-platen machines – Oscillating
Patent
1996-02-28
1998-02-17
Yan, Ren
Printing
Bed-and-platen machines
Oscillating
101327, B41F 1700
Patent
active
057181730
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a stamping apparatus comprising a stamping head, a stamping pad, and a displacement mechanism for the stamping head in order to move it between a wetting position in engagement with the stamping pad and a stamping position in engagement with an object to be stamped.
BACKGROUND OF THE INVENTION
In a known stamping apparatus of this type, the permanent stamping pad is wettened from a supply container containing liquid ink. The supply container should regularly be replenished and due to the liquid ink, it regularly involves spillage which is of course cumbersome and time consuming.
Another disadvantage is that the ink is of a quick-drying type such that the stamping pad dries up even if the stamping apparatus only stops for a moment.
SUMMARY OF THE INVENTION
The object of the invention is to provide a stamping apparatus of the type mentioned in the preambe in which these disadvantages are removed in a simple but effective way.
For this purpose, these stamping apparatus according to the invention is characterized in that the stamping pad is an exchangeable disposable stamping pad impregnated with ink which is solid at room temperature and only becomes workable upon heating, the heating means are arranged for heating the stamping pad.
Such stamping pad does not lead to spillage during mounting and dismounting because the ink is solid then and the stamping pad does thus not come off. Only during heat treatment up to for example ca. 120.degree. C., the ink becomes liquid and deliveres the ink to the stamping head. During interruption of the operation of the stamping apparatus, the heating means may be switched off leading to solidification of the ink. When the ink is heated once more, the ink becomes workable again. When the ink, which is absorbed within the stamping pad, is used, the ink pad may simply be exchanged.
The heating means may for example comprise a metal, preferably an aluminium casing having a heating element.
In this matter, the whole stamping pad may be heated uniformly with the aid of the well conducting metal casing.
A favourable embodiment of the stamping apparatus according to the invention is characterized in that the stamping head comprises a metal text holder which, in the wetting position, is lying near the heating means.
This embodiment is particularly advantageous when using very quick drying ink which can dry out even in the short time for the displacement from the wetting position to the stamping position. This is prevented by said measurements, because the metal text holder is heated by the heating means in the wetting position of the stamping head and the heat is sufficiently retained for keeping the stamping head and the ink thereon warm during the displacement to the stamping position.
It is favourable if the stamping pad is roller-shaped and the casing of the heating means being cylinder-shaped having an opening in the casing for allowing passage of the stamping head, wherein the stamping apparatus preferably comprises a drive means for rotating the roller-shaped stamping pad about the center line.
In this manner, the stamping pad is heated uniformly and the stamping pad is allowed to deliver the ink to the stamping head in a uniform way due to its rotation about the center line.
Preferably, the drive means is coupled to the displacement mechanism for the stamping head so that those separate motor or the like is necessary.
In this way, the spring pin slightly penetrates into the stamping pad in the wetting position of the stamping head and if the spring pin upon the displacement of the stamping head to the stamping position, moves from the stamping pad in a non-radial direction, the spring pin will slightly carry along the stamping pad so that the stamping pad will rotate through a small angle.
The invention will hereafter be elucidated with reference to the drawing showing two embodiments of the stamping apparatus according to the invention by way of example.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view
REFERENCES:
patent: 4444108 (1984-04-01), Jenness, III
patent: 4566386 (1986-01-01), Davison
patent: 5146851 (1992-09-01), Anderson et al.
patent: 5450793 (1995-09-01), Dobson et al.
patent: 5507227 (1996-04-01), Frazer
patent: 5515780 (1996-05-01), Cheever et al.
B.V. Korthofah
Yan Ren
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