Method and control for conveying a striplike recording medium with marginal perforation in a printer
AssigneeOce Printing Systems GmbH
InventorHolger Hofmann
Life of this patent
Estimating the term…
Abstract
A method and a control for a drive which is devoid of a sprocket feed and located in an electrographic printer which outputs information on a striplike recording medium divided up into pages. It is possible to determine in a start mode whether perforated or non-perforated paper has been inserted into the printer. A recording medium with marginal perforation is initially conveyed in steps according to a control grid until it fits tightly into a larger conveyor grid which corresponds to a fraction of the distance between perforations. Subsequently, the recording medium is conveyed in normal operating mode in steps according to the conveyor grid.
Claims18
A method for controlling a tractorless drive in an electrographic printer which prints by page on a band-shaped recording medium, comprising the steps of:
- first transporting a margin-perforated recording medium in a start mode in increments of a control grid and fitting the control grid into a second grid forming a transport grid which is larger than the control grid, and which corresponds to a fraction of hole spacing;
- in a drive control receiving target signals as image generating signals of a first frequency which are generated by an image generating unit or are synchronous to signals of the image generating unit, actual signals of a second frequency being received by a sensor arrangement that continually scans the recording medium, and forming control signals of a third frequency for driving a drive motor from a comparison of the target signals and the actual signals;
- providing the drive in increments of the control grid, and regulating a speed of the drive motor;
- and
- the control signals for the drive motor not standing in a fixed frequency ratio to the image generating signals.
A control for a tractorless drive in an electrographic printer which prints on a web-shaped recording medium page by page, comprising:
- a control unit which controls a motor in a start mode such that the recording medium in the start mode is first transported in increments of a control grid, and is thus fitted into a second grid comprising a transport grid, which is larger than the control grid and which corresponds to a fraction of the hole spacing;
- the control unit being constructed so as to be able to receive target signals as image generating signals of a first frequency which are generated by an image generating unit or are synchronous to signals of the image generating unit, and are able to receive actual signals of a second frequency from a sensor arrangement that continuously scans the recording medium, and is able to form control signals of a third frequency for driving a drive motor from a comparison of the target signals and the actual signals;
- the control unit controlling the driving in increments of a control grid;
- and
- the control unit control signals for the drive motor not standing in a fixed frequency ratio to the image generating signals.
An electrographic printer, comprising:
- a drive and a control unit;
- said control unit controlling the motor in a start mode such that a recording medium in the start mode is first transported in increments of a control grid, and is thus fitted into a second grid comprising a transport grid which is larger than the control grid and which corresponds to a fraction of the hole spacing;
- the control unit being constructed so as to be able to receiver target signals as image generating signals of a first frequency which are generated by an image generating unit or are synchronous to signals of the image generating unit, to be able to receive actual signals of a second frequency from a sensor arrangement that continuously scans the recording medium, and to be able to form control signals of a third frequency for driving a drive motor from a comparison of the target signals and the actual signals;
- the control unit controlling the driving in increments of a control grid;
- and
- the control unit control signals for the drive motor not standing in a fixed frequency ratio to the image generating signals.
Dependencies are inferred from the claim text.