Sheet feeding or delivering – Feeding – By means to convey sheet
Patent
1996-02-05
1997-09-23
Milef, Boris
Sheet feeding or delivering
Feeding
By means to convey sheet
271270, 271277, 271202, 271204, B65H 702, B65H 2966
Patent
active
056696043
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a system for delivering printhouse products, in particular folded newspapers, from moving flow of the products in imbricated formation to gripping means in connection with a chain conveyor. Mainly in the production of newspapers on rotary presses it is customary that the papers are delivered in imbricated formation on a conveyor belt, but at a later stage of the flow it may be desirable that the flow is guided both upwardly and downwardly, whereby it is usual to let the product be transferred to conveying means that positively hold the single products, this suitably being done by means of a chainlike gripping conveyor. This latter should then be equipped with suitably interspaced grippers that can be actuated for gripping the products advanced on the conveyor belt.
The product flow appears with a relatively high velocity, and in practice it has been found that it is very difficult to arrange for the relevant transfer in a fully safe manner. For natural reasons it is highly disturbing if the transfer gets out of order, as the rotary press can only be stopped by extreme emergencies once the production has started.
SUMMARY OF THE INVENTION
Generally, according to the invention, a transfer with increased safety is obtainable when where is arranged, immediately before the place of transfer, an acceleration of the products advanced on the conveyor belt, such that these products can be brought to be actively projected into the further conveying gripping means of the gripping chain system. These grippers, for natural reasons, should be advanced in synchronism with the products on the first conveyor, but in successively either raising the delivery speed of the products or periodically lowering the receiver velocity of the gripping means it will be achievable for the leading edges of the advanced products to be brought into a safe engagement with the gripping means of the succeeding gripping conveyor.
It is quite important, however, that the products are accelerated in a uniform manner. From the rotary press they are delivered with a non-uniform precision in the imbrication pattern, and care must be taken that after the acceleration they are delivered to the gripping chain in an at least almost uniform manner. It has been found that the products in the imbricated formation, when transferred from the first conveyor directly to the faster conveyor, may become mutually spaced in an irregular manner in the accelerated row of products, and for the invention it is important to indicate how this problem can be overcome. It will be possible to use one or more of the following measures:
1) In the transfer area, use is made of an overlying pressure belt at the delivery end of the supplying conveyor belt, such that the products are not released for any relative displacement until after their rear ends having left this area, i.e. from a location where a certain displacement force may already have been applied to the products. In case of minor differences the products might otherwise be projected into mutually different positions, and this will be counteracted by the measure mentioned here.
2) The receiving acceleration conveyor is mounted at a level somewhat lower than the feeding conveyor, whereby the row of imbricated copies carries out a certain dive in the transition area. In this dive the copies will be freely carried and be moving downwardly, whereby the friction between them will be reduced in the critical transfer area. This will contribute to ensuring that small differences in the friction between the products will not give rise to noticeable mutual displacements between the products when these are caused to be projected by the action of the acceleration belt.
3) Above the acceleration conveyer there is mounted a rotary roller having projecting fingers or ribs which, by a synchronized movement, can operate to press down the front edge area of the successively advanced products, down against the acceleration conveyer. Hereby it is possible to work with qui
REFERENCES:
patent: 4201286 (1980-05-01), Meier
patent: 4241910 (1980-12-01), Matsuo
patent: 4320894 (1982-03-01), Reist et al.
patent: 4333559 (1982-06-01), Reist
patent: 4550822 (1985-11-01), Meier
patent: 4566687 (1986-01-01), Faltin
patent: 4905981 (1990-03-01), Reist
Milef Boris
Thorsted Maskiner A/S
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