image forming device

Abstract

The present invention provides an image forming apparatus which designs a method of feeding paper from a paper adjustment unit to an image forming unit in double-sided printing mode, thereby avoiding motor imbalance in the paper conveying unit and ensuring productivity of the image forming unit. Equipped with: an image forming unit that forms an image on one side of the paper fed from the one-sided paper feeding path and conveys the fixed paper to the double-sided paper feeding path; A curved paper adjustment section in the paper width direction; located on the upstream side of the paper adjustment section and arranged on the double-sided paper feeding path, a paper delivery section that transports the paper with an image formed on one side to the paper adjustment section by the delivery roller; The paper fed from the single-sided paper feeding path and the paper fed from the double-sided paper feeding path are alternately conveyed to the image forming part by controlling the paper adjusting section and releasing the pressure of the conveying rollers of the paper conveying section after detecting that the paper arrives at the paper adjusting section. connected to the control unit.

Description

technical field [0001] The present invention relates to an image forming apparatus suitable for use in a color printer, a monochrome printer, a copier, or a multifunction machine having these functions. Background technique [0002] In recent years, image forming apparatuses having a double-sided printing mode for forming images on the front and back of paper have been increasingly used. Figure 8 It is a cross-sectional view showing a configuration example of a conventional image forming apparatus 200 . Figure 8 The image forming apparatus 200 shown has: a transfer unit 7, an image forming unit 10, a paper adjustment unit 20, a single-sided paper feeding path 21 through which paper passes in the single-sided printing mode, and a single-sided paper feeding path 21 in the double-sided printing mode. In other cases, the double-sided paper feeding path 26 , the paper conveying part 30 and the paper turning mechanism 60 pass through the paper. [0003] The single-sided paper fe...

AI Technical Summary

Problems solved by technology

However, in the way of conveying and staying four sheets of paper-the surface and the back are continuously formed with images, if the interval T+surplus time β is set, the time between the paper P fed from the double-sided paper feeding path 26 to the paper adjustment section 20 will be extended. There is a problem that the productivity of the image forming unit 10 is reduced in the double-sided printing mode due to the gap between the paper P fed from the double-sided paper feeding path 26 to the paper adjustment unit 20

according to Figure 9 The example shown in (D) requires β N pages of action time

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