Acquisition of printed media with defined traction

Details Acquisition of printed media with defined traction Acquisition of printed media with defined traction

1998-10-22

2001-01-02

Nappi, Robert E. (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S433000, C318S434000

Utility Patent

active

06169380

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
This applications based on co-pending priority German Patent Application 19747062.9-53, which is incorporated herein by reference.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable.
REFERENCE TO A “MICROFICHE APPENDIX”
Not Applicable.
BACKGROUND OF THE INVENTION
1. Technical Field
The invention relates to the control conception for an acquisition unit of printed media (documents) for detecting and regulating friction internal to the device. The acquisition unit is largely adapted to printers and copiers which output the printed media at different or varying rates.
2. Background Art
In the postpublished DE 196 33 740 A1 a process is described in which documents output by an output device are acquired by an acquisition unit for deposition in sorted form.
The core of the described process is that via a defined motor moment for the transport roller system of the acquisition unit a traction is exerted onto the documents as long as these are within the transport system of transfer and acquisition unit.
One disadvantage in this process is that the friction conditions in the transport system can have a strong effect on the resulting traction of the document during the acquisition. The motor moment of the acquisition unit must be selected to be such that at maximum friction the document is still transported reliably. If the friction in a device is very low, at given motor torque a high traction on the document results therefrom so that it is possible that the documents may be pulled out of the output device.
In the unpublished German Patent Application 197 33 697.3 a curvature is forced onto the entering document based on which the paper speed of the entering document can be derived. In this solution only the reset force of the sensor which detects the degree of curvature acts onto the traction of the document. The disadvantage in this process is the complex and expensive construction of the run-in region as well as the expenditures for the additionally required sensor system.
From DE 26 42 818 A1 is known an arrangement for transporting documents comprising a document transport device which exerts traction onto the documents.
SUMMARY OF THE INVENTION
The object of the invention is keeping the traction on the documents low or within defined limits.
The task of the invention comprises reliably acquiring documents from an output device such as a printer or a copier, with variable output speed without impermissible tractive forces being exerted onto the documents. For this purpose the rotational speed of the transport system of the acquisition unit is determined under no-load condition and the torque of the drive is reduced, for example by current imitation, until the transport rate of the acquisition unit is just above the maximum occurring transport rate of the output device. The torque value thus determined, which represents the torque requirement for overcoming the friction of the system, is stored and set as the nominal value during the document acquisition. As a drive motor can be used DC current motors as well as also load-controlled electronically commutated motors.


REFERENCES:
patent: 4980623 (1990-12-01), Anton
patent: 5205548 (1993-04-01), Yamada et al.
patent: 5838132 (1998-11-01), Tanaka
patent: 5971388 (1999-10-01), Hattori et al.

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