Device for the take-up of plane sheets with peel-off by turbulen

Sheet feeding or delivering – Feeding – Separators

Patent

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Details

B65H 314

Patent

active

053281659

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Field of the invention
The present invention relates to a device for the automatic and uniform take-up of plane sheets, for example sheets of paper, from a sheet stack feeding a machine in which plane sheets move along one by one, for example an assembler.
2. Prior art
There are various types of sheet take-up devices capable of delivering the sheets at a predetermined rate. In suction devices, the sheets are in contact with suckers and they are transported as a result of the mechanical displacement of the suckers. The rubber of the suckers dries out and is the cause of more or less frequent replacements. Moreover, these devices require exact adjustment of the suction. An anomaly (for example a double sheet) is detected only when the sheets have executed a certain amount of movement, and this often gives rise to jamming, rejects and the intervention of the operator.
Friction devices employ a constant pressure maintained on the sheet by means of pads or rollers. It is difficult to adjust the pressure, and this makes it possible to process only a somewhat limited range of sheets and does not allow the processing of very thin sheets, for example delicate papers.
Suction and friction devices are not insensitive to variations in the parameters which characterize the sheets to be extracted from a stack: physical dimensions, weight and overall size of the sheets, their humidity, their mutual adhesion, and static electricity, moreover these parameters being variable at random within the same stack of sheets of the same type. With particular regard to paper sheets, it should be noted that the consumption of paper is tending towards a steady increase in the use of delicate papers, for example self-copying papers. The friction machines known at the present time do not satisfy the working conditions in this sector, and suction machines satisfy them only with difficulty.
Also known is a device for the take-up of sheets by suction through a movable grid, which is of simple and compact construction and which is capable of operating reliably and at a high rate with sheets of different thicknesses, types and dimensions, thus considerably reducing rejects and interventions by the operator.
To ensure a uniform rapid flow of the sheets, it is essential that the sheets be extracted and delivered one by one in a reliable manner. Now it can happen that two or more sheets adhere to one another or that the upper sheet of a sheet stack does not succeed in being extracted from the stack.
A stack of sheets, for example of paper, is defined by various parameters, such as the dimensions and weight of the sheets, static electricity, humidity and mutual adhesion attributable to the freshness of the printing ink. These parameters are variable at random within the same stack of paper of the same type. This causes problems regarding the separation of the sheets in the assembling machines, thus necessitating preprocessing before passing to the machine.


PRESENTATION OF THE INVENTION

The present invention affords a solution to this problem and relates to a device for effectively peeling off a sheet stack installed in the feed compartment of a machine, so as to ensure the delivery of the sheets one by one, even when sheets adhere to one another or when the upper sheet does not succeed in being extracted from the sheet stack. The particular features of the invention are defined in the accompanying claims.


DESCRIPTION OF THE DRAWINGS

The invention is presented below by means of the accompanying drawings. In these drawings:
FIG. 1 is a partially sectional elevation view of an exemplary embodiment of the invention.
FIG. 2 is a cutaway view along the line II--II of FIG. 1.
FIG. 3 is a view along the line III--III of FIG. 2.
FIG. 4 is a view along the line IV--IV of FIG. 2.
FIG. 5 is a block diagram of the control system of the peel-off device according to the invention.
FIGS. 6 and 7 illustrate two operating states of the peel-off device according to the invention.


DESCRIPTION OF AN EXEMPLARY EMBODIMENT

Referring to FIG. 1, t

REFERENCES:
patent: 4699369 (1987-10-01), Zirilli
patent: 4887805 (1989-12-01), Herbert et al.
patent: 5181706 (1993-01-01), Yamamoto et al.

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