Sheet feeding or delivering – Feeding – Pack holders
Patent
1994-02-04
1996-04-30
Skaggs, H. Grant
Sheet feeding or delivering
Feeding
Pack holders
271160, 271 301, B65H 108
Patent
active
055117732
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
a) Field of the Invention
The invention relates to a compensating or adjusting support arrangement such as for a stacking table for a printing machine for printing envelopes, the top envelope of an envelope stack resting on a movable top surface being brought into a horizontal position and supplied by means of a suction device to the printing apparatus. The inventive arrangement may be in the form of a supplementary device for the printing machines. Such supplementary devices are suitable for printing machines for all standard printing procedures, i.e. letterpress, litho, screen and photogravure.
b) Background Art
In standard printing machines for envelopes, the envelopes are stacked in large numbers and conveyed via a suction feeder to the feed table on which the printing process is carried out. When stacking a large number of envelopes, a level difference occurs because of their flaps and/or multilayer gluing when unidirectionally positioned, the thicker areas of the envelopes are higher than the thinner areas and therefore it is not possible to ensure a horizontal position of the top envelope taken from the suction device. As a result, there is only a poor suction effect on the envelope and the printing process can no longer take place in a precise and accurate manner.
In order to prevent this, compensation is necessary and this has been done in the past by using, prior to the printing press, rollers, wedges or the like which are placed between the envelopes in the envelope stack and during the printing process, have to be regularly manually removed. Therefore, someone must always be present at the printing machine throughout the printing process.
OBJECT AND SUMMARY OF THE INVENTION
The primary object of the invention is therefore to provide an arrangement or apparatus of the aforementioned type, which ensures a level compensation of the envelope stack in such a way that the top envelope to be taken from the suction device is positioned horizontally and, consequently, there is no need to insert and remove rollers, wedges or the like, or for the permanent presence of a person.
This object is achieved in that, in the case of such compensating support arrangement a bottom surface is provided on which is fixed at least one spring holder or retainer with at least one adjustable and replaceable spring element, which supports the top surface.
This construction of the compensating support arrangement achieves the object of having the top envelope horizontally oriented, in that, as a function of the height of the envelope stack, the top surface is adjusted in accordance with the different thickness.
Thus, in accordance with the invention, a compensating support arrangement for a stack of envelopes located on a stacking table of a printer for aligning the uppermost envelope for a take-off suction device of the printer arranged above the envelope with operational accuracy comprises a base plate adapted to be supported on the stacking table, a bearing table arranged at a distance above the base plate and provided for the support of the envelope stack, at least one spring element arranged between the base plate and bearing plate and means for holding and guiding the bearing plate in position relative to the base plate.
Also in accordance with the invention, in a printing machine for printing on a variety of paper products including envelopes, said printing machine having a stacking table for aligning an uppermost envelope of an envelope stack and a take-off suction device arranged above the uppermost envelope of the stack for removing said uppermost envelope with operational accuracy, the improvement comprising a compensating support arrangement to assure that the uppermost envelope of the stack is essentially horizontal when removed by the take-off suction device. The compensating support arrangement includes a base plate supported by the stacking table, a bearing plate arranged at a distance above the base plate and provided for support of the envelope stack, at least one spring ele
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patent: 3446500 (1969-05-01), Meier
patent: 3572686 (1971-03-01), Day
patent: 4188026 (1980-02-01), Nagai
patent: 4345752 (1982-08-01), Nakamura et al.
patent: 4699369 (1987-10-01), Zirilli
patent: 4744472 (1988-05-01), Pfister
patent: 4942435 (1990-07-01), Kneisel et al.
Patent Abstract of Japan, vol. 14, No. 361 (M-1006)(4303) 6 Aug. 1990 JP 2-127325 (NEC Corp.) 16 May 1990.
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