Sheet feeding or delivering – Special articles – Envelope
Patent
1989-07-10
1992-09-22
Olszewski, Robert P.
Sheet feeding or delivering
Special articles
Envelope
271 5, 271 6, 271 99, 271104, 271225, 271265, 271202, 271216, B65H 522, B65H 334, B65H 2966
Patent
active
051490765
DESCRIPTION:
BRIEF SUMMARY
The invention in question deals with the fundamental problem of how to feed envelopes for printing to a printing machine without an interruption in work or a tailback coming about. If, for example, a pile of envelopes is placed in front of a printing machine to be printed, then it will lift these envelopes individually in the printing cycle, e.g. by means of a suction arm, and carry out the actual printing process. In order to be able to place further envelopes from additional boxes, the machine would have to be switched off. In order to prevent this, one is forced to construct envelope feeders which continuously feed the printing machine with envelopes without the printing machine having to be interrupted.
According to the current state of the technology, there have up to now been three different solutions of this problem, none of which was in a position to satisfy completely.
1st. Variation
The printing machine and the envelope feeder are built together as a single compact machine. There is thus no possibility of use on other printing machines.
2nd. Variation
Suction rods or suction plates take away the envelopes individually, which then have to go to the printing machine synchronously. The synchronous device existing on the market however only fits one printing machine available in the trade and is thus not compatible with others.
3rd. Variation
A further envelope feeder is in fact partly compatible, but works with a rubber band, which results in a great division coming about in the overlap. In addition, this envelope feeder feeds the envelopes, as do all other feeders mentioned, in a longitudinal direction, i.e. the envelopes have the short side at the front and the flap is not at the front, but on the side. This means that this envelope feeder cannot be used for sheet-fed offset presses, which are intended for sheets of A3 format. The envelopes cannot be taken on by the overlap feeder of this printing machine, as the width of the front smaller side is too small. This is above all true for the C6 envelope.
The gap in the market mentioned here can now be filled with the invention in question, as an envelope feeder has been constructed which can also transport the envelopes transversely, i.e. with the broader side in front. Thus an envelope feeder has been constructed which can be used for virtually all printing machines.
FIG. 1a is a side elevational view of a stack of envelopes having narrow flaps with a predetermined overlap distance from which an envelope feeder can feed envelopes in accordance with the present invention.
FIG. 1b is a side elevational view showin the stack of envelopes when the overlap distance is too large;
FIG. 1c is a side elevational view showing the stack of envelopes when the overlap distance is too small;
FIG. 1d is a side elevational view showing what happens when the overlap distance is too small as in FIG. 1c;
FIG. 2a is a side elevational view of the lateral feed means of an envelope feeder in accordance with the present invention;
FIG. 2b is a side elevational view as in FIG. 2a just as the bottom envelope is moved from the stack;
FIG. 2c is a side elevational view as in FIG. 2a showing several envelopes moved from the stack with a predetermined degree of overlap;
FIG. 3a is a side elevation view of an envelope feeder in accordance with the present invention; and
FIG. 3b is an enlarged partial view of FIG. 3a.
In order to be able to transport the envelopes with the broad side and thus the flaps at the front, without the following envelopes falling under their flaps when being pushed together, it was firstly necessary to solve the problem of even being able to construct an envelope feeder which works very reliably with an overlap distance of, for the sake of example, 2 cm, and only has very low values of deviation. As is shown in FIG. 1, this is above all necessary for self-adhesive envelopes 1, which only have a very narrow flap 2 of about 2 cm. In FIG. 1b), it is shown what happens when the overlap distance, as shown in FIG. 1a), is too large. The following enve
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Olszewski Robert P.
Reiss Steven M.
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