Paper conveying controller and method thereof

Abstract

The present invention provides an image forming apparatus capable of double-sided printing on paper with labels attached thereto. It is provided with a plurality of paper sensors in a direction perpendicular to the paper conveying direction at the outlet of the paper supply tray. According to the difference between the output signals of each paper sensor at high potential and low potential, the position of the label and the length of the label in the conveying direction are obtained. When the label is located at the front edge of the paper conveying direction and does not pass the conveying control sensor X at the detection point on the paper conveying path, take the time when the output signal of the conveying control sensor X is at a high potential as a reference to implement the action The driving device α, its action moment only needs to move forward for the time corresponding to the length of the label. On the other hand, when a label is to pass through the sensor X for conveyance control, or when paper without a label is used, it is not necessary to advance the operating timing of the device α. Accordingly, even when the reverse side of the paper is reversed for printing on the reverse side during double-sided printing, the timing of the operation of the device α can be appropriately set.

Description

technical field [0001] The present invention relates to a sheet transport control technique used in copying apparatuses, printing apparatuses, etc., and particularly relates to a technique for carrying out sheet transport with tabs attached thereto. Background technique [0002] The image-forming apparatus (image-forming apparatus) that comes out in recent years, such as copier and printing apparatus etc., has been able to automatically insert label with paper. Since tabbed paper has a tab portion formed on a part of the paper, its paper size cannot be set in the same way as regular paper with a rectangular shape. Moreover, the conventional paper conveying control technology utilizes sensors arranged at various points on the paper conveying path (transport pathor papaer path) to detect the passing state of the conveyed paper, and then according to the time when the passing action occurs, the The motors and other devices installed in each part implement drive control. Howev...

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Problems solved by technology

[0004] However, the above-mentioned prior art needs to limit the setting direction of the paper with the label in the paper supply tray, and the user must set the paper in a prescribed manner, so the operation is cumbersome.

Moreover, the configuration positions of the stapler (stapler) and the puncher (puncher) relative to the paper on the post-processing device (for example, at the position directly in front of the paper conveying direction or at the position in the side direction, etc.) are often relative to each other. Different, so when the setting direction of the paper with the label is limited, there will also be a problem that it is difficult to choose a post-processing device that is compatible with the direction.

[0005] Moreover, in the device disclosed in Japanese Patent Application Laid-Open No. 8-245047, when it is necessary to implement duplex printing and the paper with the label is reversed to the reverse side, the direction where the label part is located will be oriented towards the front side of the implementation. Printing is in the opposite direction, so it is difficult to determine the correct time when the action occurs to implement conveying control, so there is also the problem that it is difficult to perform double-sided printing on paper with labels

[0006] And, by the disclosed device of Japanese Patent Application Laid-Open No. 10-67458, since the label printing device installed at the post-processing device is not a device for double-sided printing, double-sided printing cannot be implemented.

If a device capable of double-sided printing is used, the scale of the post-processing device will be too large to be realized

Moreover, the printing device that can be installed at the post-processing device can usually only print a small printing area such as a label, so there is a problem that it is difficult to use it to print the main part of the paper with the label attached. system problem

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