Sheet feeding or delivering – Delivering – Rotary conveyor
Reexamination Certificate
1998-05-20
2001-02-13
Ellis, Christopher P. (Department: 3651)
Sheet feeding or delivering
Delivering
Rotary conveyor
C271S314000, C271S184000, C270S052260
Reexamination Certificate
active
06186494
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a device for placing printed sheets on a guide.
2. Description of the Related Art
A device of this type became known in the prior art through CH-A-493 337 by the present Applicant. In this device, folded printed sheets from a stack are opened from below by opening drums and are placed on a conveying chain. Before the printed sheets are transferred to the conveying chain, each of them is thrown against a sword or knife arranged over the conveying chain. The knife is moved back and forth between a rear end position and a front end position in the direction of the conveying chain, so that the printed sheets need not be accelerated abruptly to the required transporting velocity by the drivers of the conveying chain. The sheet to be placed is thrown against the knife in the rear end position and is knocked forward by it. The difficulty in this device consists in that the knife jerks about in the manner of a spring at high speeds so that the placed printed sheet is unstable and can fly away. This difficulty exists particularly in the case of light printed sheets and at high speeds.
SUMMARY OF THE INVENTION
The object of the invention is to provide a device of the type mentioned above which avoids the above-mentioned difficulty.
In accordance with the present invention, in a device for placing printed sheets on a guide using a mechanism which accelerates a printed sheet in an off-transport direction to a transverse velocity before it is placed on the guide, the object is met by providing the mechanism with gripping means which grasp the printed sheet by its front end as seen in the off-transport direction and accelerate the sheet in the off-transport direction by pulling the sheet.
In the device according to the invention, the printed sheets are grasped and accelerated accompanied by pulling. The printed sheets can accordingly be grasped before or immediately after they have been released by the opening drums and transported in a positive manner until delivered to the conveyor chain. Since the gripping means grasp the front end of the printed sheets, the printed sheets are engaged forward of their center of gravity, which stabilizes the printed sheets in the running direction.
A particularly reliably operating and economical construction of the device according to the invention can be realized in accordance with a further development of the invention in that the gripping means execute an orbiting or rotating movement. A guiding of the printed sheets that is particularly safe from disturbance is ensured when the printed sheets are decelerated sinusoidally in the depositing direction and are accelerated sinusoidally in the off-transport direction. In this way, higher speeds can be achieved even with printed sheets which are light and difficult to handle. The invention accordingly makes it possible for even light printed sheets to be transported at higher speeds compared with the prior art, while nevertheless ensuring the required reliability of operation. The device according to the invention is equally suitable for head-folded printed sheets and tabloids.
Further advantageous features are indicated in the dependent patent claims, the following description, and the drawing.
REFERENCES:
patent: 1118409 (1914-11-01), Gitzendanner
patent: 2251943 (1941-08-01), Kleineberg
patent: 4260145 (1981-04-01), Mebus et al.
patent: 4299378 (1981-11-01), Muller
patent: 4350327 (1982-09-01), Muller
patent: 4491311 (1985-01-01), Glanzmann
patent: 493337 (1970-08-01), None
patent: 0708044 (1996-04-01), None
Ellis Christopher P.
Grapha-Holding AG
Kueffner Friedrich
Mackey Patrick
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