Accumulator with "first page holder" feature

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CURRENT STATE-OF-THE-ART

Based on programming requirements a typical in the mail inserting industry, it is customary to identify individual document groups with optical marks or bar codes, which identify all pages belonging to a particular group. When processing groups in sequence, such optical mark coding may not permit the timely recognition of an end of group, especially when the end of group is supposed to be triggered solely by the appearance of a new group ID, as printed on the next following document.

The industry has dealt with this condition by providing a special module, positioned prior to the actual accumulator, and which would permit the capture of the next following first page in what is referred to as a "first page hold" position until such time that the prior group has vacated the accumulating station.

This practice of extra first page hold positions adds a minimum of a fold document depth, plus additional transport mechanisms to the length of the entire system, let alone increases the cost and complexity of the processing system.

NEW STATE-OF-THE-ART

The invention further on described will not only reduce the required space, but will also permit the retrofitability of such first page hold feature to accumulation systems, which have previously not been fitted with such an extra module as described before.

BRIEF DESCRIPTION OF THE DRAWING

A preferred embodiment of the invention has been chosen for purposes of illustration and description and is shown in the accompanying drawings forming a part of the specification, wherein:

FIG. 1 is a diagrammatic view showing the structure used in connection with the present invention.

Starting with a feeder 1, individual documents are sent to the accumulator area comprised of an accumulator ramp 2 and a document accumulation area 3, as well as the clutched stop rollers 4. In addition, the accumulator features belts driven by a clutched roller pair 5, designed to transport the individual sheets into the accumulator area 3.

Under normal operations, i.e., without first page hold requirements, the feeder issues under optical mark control all documents belonging to one group into the accumulator area 3. Upon the recognition of a completion of the set (this information being contained on the last sheet of the document of the set fed), the clutched stop rollers 4 eject the finished group into the next following work station. The belted transports and rollers 5 are running continuously in such applications since the rollers 5 operate independently of clutched stop rollers 4.

In a scenario where the first page hold requirement has to be dealt with, the before described accumulator arrangement operates as follows:

The normally continuously running rollers 5 and corresponding belts are being clutched and may be operated as and when required. Since this roller pair 5 is also operating the corresponding transport belts, roller pair 5 will, therefore, be in the control of the forward movement of any documents entering the accumulator.

When processing a first page hold OMR scenario, the first group will be issued to the accumulator area 3 until a page appears which identifies itself as the first page of a new group. In this case, the clutched roller pair 5 is energized and stops the document on top or in the area of ramp 2. The first group is now being ejected through the clutched stop rollers 4. The clutched roller 5 starts operation again issuing the first page into the accumulator with all subsequent pages following until again a first page of a new group is recognized and stopped as previously described.

A unique feature of this new concept is the ability to install a clutch onto an existing roller assembly 5, thus converting a field installed system into a first page hold concept system.

It is further envisioned that the drive in the ramp area 2 will be enhanced through the positioning of transport rollers which, in turn, are driven from belts originating from the left roller 5. Such additional transport rollers could function for the increase of drive force in order to both stop the first page document in the desired position, and at the same time to accelerate such document as and when required.

As many and varied modifications of the subject matter of this invention will become apparent to those skilled in the art from the detailed description given hereinabove, it will be understood that the present invention is limited only as provided in the claims appended hereto.

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