Typewriting machines – Including adjustment for optimum printing plane – Responsive to thickness of record-medium
Patent
1999-05-12
2000-08-01
Eickholt, Eugene
Typewriting machines
Including adjustment for optimum printing plane
Responsive to thickness of record-medium
101 56, 101 91, 101227, B41J 1120
Patent
active
060956992
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns machines for printing flat objects and, more particularly mail-handling machines intended to apply a cancellation or prepayment mark on envelopes, by printing through means of a rotative marking drum in conjunction with a counter-printing roller, permitting achievement of the printing force.
BACKGROUND OF THE INVENTION
Document EP-A-0547922, among many others, makes known such a machine for printing flat objects (envelopes in particular) of various thicknesses successively transported the length of a table by means of a feed mechanism and printed by means of a printing mechanism, the feed mechanism comprising at least two rollers, at least one roller of which is motorized, between which the objects pass, the printing mechanism comprising a turning printing drum and a motorized counter-printing roller.
The current machines printing the cancellation or prepayment marks with the aid of a rotative drum use one motor to drive the envelopes and another to drive the printing drum. The movement of the drum is described precisely in Document WO-A-96/26502. The drive motor of the printing drum performs an abrupt acceleration movement to permit the drum to meet the letter in perfect synchronization. Further, to permit the handling of thick envelopes, the drive motor of the printing drum must shift the counter-printing roller. As this last is firmly pressed against the drum, the abrupt movement performed by the drive motor is very important.
On the other hand, stepping motors are employed more and more for the printing drum motorization. While these show great advantages, they are nevertheless sensitive to abrupt changes in load.
SUMMARY OF THE INVENTION
The object of the present invention is to reduce these adjustment disadvantages and substantially decrease the work to be performed by the drive motor of the print drum.
The invention attains its object in the form of a machine of the type described above, thanks to an automatic and simple device for thickness compensation, that is, the axes of the counter-printing roller and one of the two feed rollers are supported by the ends of a lever pivoting in its center and linked at this place by a stop link such that the displacement of the said feed roller resulting from the passage of an object between the two feed rollers causes a pivoting of the lever and therefore a corresponding shifting of the counter-printing roller, if this was not already shifted by at least the said corresponding shifting by the passage of a preceding object.
Said otherwise, instead of the shifting action of the counter-printing roller being effected by the drive motor of the printing drum, it is in part effected by the motor of the feed rollers and the envelope itself at the moment it passes into the feed rollers. Therefore there is a decrease in required power from the drum motor and an augmentation in the same proportions of the power of the motor driving the envelopes. The technologies of the two motors being quite different, economical for the driving of the envelope and expensive for the driving of the printing roller, the present invention thus permits substantially decreasing the cost of the machine.
Advantageously, the said thickness-compensating lever is comprised of two covers, pivoted one on the other by a joint. A screw passes through an extension of one of the covers to rest against the other, in order to comprise an adjustable stop of the said joint.
Preferably, springs return the rollers shifted by the lever toward contact respectively with the opposing roller and the printing drum.
Advantageously, the counter-printing roller is motorized by the feed roller motor by means of a set of belt-pulleys.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will be apparent upon the reading of the following description of an example of embodiment and referring to the attached drawings on which:
FIG. 1 is a developed sectional view of a printing machine according to the invention,
FIG. 2 is a
REFERENCES:
patent: 4470349 (1984-09-01), Godlewski
patent: 4575267 (1986-03-01), Brull
patent: 4705413 (1987-11-01), Arnoldi et al.
patent: 5203263 (1993-04-01), Berger et al.
patent: 5355155 (1994-10-01), Mistyurik
patent: 5379692 (1995-01-01), Haug
patent: 5961224 (1999-10-01), Baitz et al.
patent: 5980132 (1999-11-01), Kawai
Baumann Herve
Viennet Franck
Eickholt Eugene
SECAP
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