Sheet feeding or delivering – Feeding – Multiple supplies
Patent
1983-01-18
1985-04-30
Schacher, Richard A.
Sheet feeding or delivering
Feeding
Multiple supplies
271 11, 271 94, 271154, 271 301, B65H 508
Patent
active
045139563
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for the conveying of sheets to a processing station, comprising at least two stock holders for sheet piles, in which each sheet pile is provided with a separation roller which can be activated selectively in order to convey a sheet from a stock holder to a processing station, and conveyor tracks provided with conveyor elements which connect the stock holders to the processing station.
Such a device is known from the Netherlands patent application No. 7404899.
A device is described therein which is provided with a number of stock holders with means forming part of each stock holder to separate a sheet from the pile included therein and means to convey that sheet to an exposure station. The feed from the various stock holders to the exposure station is effected according to the abovementioned Netherlands patent application No. 7404899 via entirely separated conveyor tracks. The feed of sheets via entirely separated conveyor tracks has as a disadvantage that a large number of conveyor and driving means are required, which requires a complicated sheet feeding system requiring a lot of space.
The object of the invention is to provide a conveying device for sheets which does not have the abovementioned disadvantage, and which is able to convey sheets with a relatively small number of conveyor and driving means from one of a number of stock holders to a processing station.
According to the invention this object is achieved in that the conveyor track for each stock holder which is situated nearer to the processing station coincides with a part of the conveyor track for each holder situated further away from the processing station, in that the conveyor elements at least partially consist of roller pairs of which each time the driven roller is formed by a separation roller and in that when one separation roller is activated, all rollers are driven in a rotating way. In this manner it is achieved that with a relatively small number of conveyor and driving means sheets from one of a number of stock holders can be conveyed to a processing station in such a way that a simple sheet feeding system taking little space is created.
Preferably, each separation roller in a non-activated position is not in contact with the sheet pile and means are available which when the separation roller is activated, effect a contact between the separation roller and the sheet pile.
In this way it is achieved that with simple means it is guaranteed that sheets can only be fed from the selected stock holder.
Preferably the sheet pile at least partially rests on a movable plate which has been fitted against a wall of a space which can be connected to a compressed air source and discharge openings are formed in the wall.
In this way it is achieved that each separation roller can be installed in a fixed position and that the sheet pile forming part of the activated separation roller can only come into contact with the separation roller during excitation by compressed air.
Preferably the separation roller is formed by a suction roller. In this way it is achieved that during the separation a sheet can simply be kept in contact with a circumferential part of the separation roller in order to be able to branch off the sheet in the conveyor track formed by roller pairs.
Preferably the suction roller is formed by a hollow cylindrical tube which on the outer surface is provided with a coating in which a number of borings have been fixed, the borings being connected to the space inside the hollow tube via a number of saw cuts fitted perpendicularly to the axis of the tube, of a depth which is smaller than half the diameter of that tube.
In this way it is achieved that a simple constructed suction roller is obtained which at the same time can function as a friction conveyor roller .
Other characteristics and advantages of the invention will become clear from the description given below of a preferred embodiment reference being made to the attached drawings, in which:
FIG. 1 is a diagrammatic cross section of a number of
REFERENCES:
patent: 3572686 (1971-03-01), Day
patent: 3990696 (1976-11-01), Landa
patent: 4066253 (1978-01-01), Lundbald
Baranski Jan A.
Sigvardt Niels H.
Carvis Thaddius J.
Johnston Albert C.
Oce-Helioprint AS
Schacher Richard A,.
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