Sheet feeding or delivering – Delivering – With transfer means between conveyor and receiver
Patent
1993-08-25
1994-11-15
Skaggs, H. Grant
Sheet feeding or delivering
Delivering
With transfer means between conveyor and receiver
271212, B65H 2938
Patent
active
053640896
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a stacking apparatus for printers to build up a stack of individual or single sheets.
DESCRIPTION OF THE RELATED ART
High-speed printers for printing of individual sheets, such as are known, for example, from PCT Published Application WO-89/08282, include stacking devices for depositing the printed individual sheets. In these stacking devices, which may be part of stacking containers, the printed sheet is deposited with the printed side downward and thus a stack of printed individual sheets is formed. This means that in the stack the side printed first lies at the bottom and the side printed last lies at the top. With this method of stacking, paper removal is not possible without interruption. In order nevertheless to make interruption-free removal possible with this method of stacking, the printer includes two or more independent output units with automatic switching-over. However, the problem remains that the operator cannot remove at any time the printed individual sheets in the correct sequence, but only obtains relatively large and unwieldy stacks, which he then also has to turn.
In specific applications, a plurality of print jobs are executed one after the other in continuous operation in high-speed printers, for example electro-photographic printers. A feature of a print job which is essential for the organization of the printing operation is that the quantity of printed recording carriers respectively assigned to a single print job has to be further handled as a batch. This means that recording carriers assigned to different print jobs have to be separated from one another at the output station of the printer in order for them to be separately bundled, packed or further handled in some other way. Such stacking devices for the optional laterally offset stacking of recording carriers in sheet form in an output compartment of a printer are known from PCT Published Application WO-89/08599.
There is also described, in European Published Application EP-B1 0 213 429, a paper stacking device for prefolded endless paper, in which the paper web is fed from below to a depositing table and the paper stack builds up from the bottom.
SUMMARY OF THE INVENTION
An object of the invention is to provide a stacking apparatus for printers to build up a stack of individual sheets, by which it is possible to build up a stack of individual sheets in such a way that it grows from the bottom to the top, so that the individual sheets can be removed at any time and without interrupting the printing operation.
A further aim of the invention is to design the stacking apparatus in such a way that stacks of individual sheets in which the stack grows from the top to the bottom and from the bottom to the top are optionally formed.
The stacking device is to be of a design which is simple and not prone to faults and is to permit a continuous depositing of the individual sheets.
This an other object are achieved in the case of a stacking apparatus in particular for printers, to build up a stack of individual sheets, having the following features: are arranged axially parallel next to each other, elements which extend in the axial direction of the roller cages and are spaced apart by gaps; depositing surfaces of a common, inner depositing surface which crosses through both roller cages and is for receiving the individual sheets to be stacked; the gaps of the transport elements to the depositing surface in such a way that they are supported on the partial depositing surfaces and device, the transport elements of the roller cages take up the individual sheets in a region of the depositing surface between the partial depositing surfaces and guide them into a depositing position above or below the roller cages.
Advantageous embodiments of the invention include providing a stacking device for individual sheets in such a way that the roller cages carry by means of their transport rollers the stack to be built up from the bottom and feed the individual sheets to be stacked to the stack fr
REFERENCES:
patent: 2859965 (1958-11-01), Pabst et al.
patent: 3807553 (1974-04-01), Billett et al.
patent: 3912253 (1975-10-01), Jarman
patent: 4737045 (1988-04-01), Koefferlein
patent: 5060025 (1991-10-01), Kummel et al.
Druzbick Carol L.
Siemens Nixdorf Informationssysteme Aktiengesellschaft
Skaggs H. Grant
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