Sheet-material associating – Associating or disassociating – Web associating
Patent
1996-03-18
1998-01-06
Nguyen, Hoang
Sheet-material associating
Associating or disassociating
Web associating
270 5207, B65H 3900
Patent
active
057046042
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention pertains to processes and devices for forming and transferring stacks of printed sheets, in which the sheets are arranged in a stream and stacked, sheet groups arranged in a descending stream, between which a gap is located, are delivered to a stop at which the stack is formed from bottom to top, wherein the stop is briefly removed from a stop position to release and remove the stack using an automatic sequence control, depending on a position of the gap located between the groups of sheets.
BACKGROUND OF THE INVENTION
Such an arrangement has become known from DE-A-1 436 485. That document pertains to the delivery, counting, and stacking of documents to form stacks containing a constant, predetermined number of documents. The individual documents are first arranged in an ascending stream. Arranging in an ascending stream means that the front edge of the next document comes to lie over the rear edge of the preceding document.
When documents thus arranged in a stream come into contact with a stop for forming a stack, the stack is formed from top to bottom, which has some disadvantages. It is therefore desirable to form the stack from the bottom to the top. This object is achieved by the prior-art arrangement according to DE-A-1 436 485 by turning documents arranged in an ascending stream by 180.degree. over a drum and feeding them thus to the stop. This measure has an extremely high space requirement and is extremely expensive.
In addition, it has been known from DE-A-1 436 485 that a gap between two adjacent documents can be formed with a rake engaging the documents arranged in a stream, and this gap is then scanned by a control member in order to stack only the group of sheets located between the gaps. This arrangement leads to the counting of a predetermined number of sheets and consequently to the formation of a stack of sheets of equal height.
In contrast, the present invention pertains to a problem that differs from the state of the art.
It is required in the area of modern data processing that data, information or the like, printed on individual sheets or on endless webs, be prepared in a ready-to-ship form by separating individual sheets from the web of sheets and to stack them. A special problem arises now due to the requirement of stacking only sheets belonging to a certain group, of subsequently transferring the stack, and of forming a new stack or another group of sheets. In the case of data storage media, which are to be stacked in a given order such that the first sheet will lie on top, it becomes necessary to form the stack from the bottom to the top.
However, such a measure has been known from DE-A-1 436 485 only in such a way that stacks containing equal numbers of documents are formed.
However, it is important in connection with the processing of documents to form stacks of different heights, depending on how many documents must be assigned to the individual process.
SUMMARY AND OBJECTS OF THE INVENTION
The primary object of the present invention is therefore to improve the above-mentioned prior-art measures such that it is possible to stack and further process groups of documents containing different numbers of documents. Whether the documents are fed in as individual cut sheets or they must be separated from a web of documents is left open.
The groups of sheets are subsequently separated before the sheets are arranged in a stream. This measure offers the advantage that the control of stack formation is also initiated with a simple automatic sequence control along with the separation of the groups of sheets.
If individual sheets are printed, the separation of groups of sheets can be performed with an arrangement according to DE-A-1 436 485, but with the difference that sheets arriving one behind the other rather than sheets arranged in a stream are to be spaced apart from each other by forming a gap.
However, a web of sheets is assumed in a preferred exemplary embodiment, in which the sheets are separated from the web by cutting, tearing
REFERENCES:
patent: 3026107 (1962-03-01), Stroud
patent: 3370843 (1968-02-01), Woodside
patent: 4265443 (1981-05-01), Berthelot
patent: 4719855 (1988-01-01), Cannon et al.
patent: 4939888 (1990-07-01), Katz et al.
patent: 4944503 (1990-07-01), Arima
Koelle Helmut
Mader Bertold
Winterstein Gerhard
Bowe Systec AG
Nguyen Hoang
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