Image forming device

Abstract

The invention relates to an image forming device, which comprises a nozzle adjusting means capable of adjusting the position relation between a plurality of nozzle retainers keeping multiple record heads and a printing vehicle loaded with the nozzle retainers. Even the nozzle retainers elevate with respect to the printing vehicle, the position of the nozzle retainers in a horizontal direction can also be maintained. Through the nozzle adjusting means, the position deviation of the recording head due to the vibration of the nozzle adjusting means can be prevented. In addition, the wearing of the nozzle adjusting means due to the repetitive elevation of the recording head can be prevented. A middle component (91) disposed between a contacting part (84c) of the nozzle retainer (27) and the nozzle adjusting means (90A) is a plate spring enabling the nozzle adjusting means (90A).

Description

technical field [0001] The present invention relates to an image forming apparatus using an inkjet system such as a printer, a copier, and a facsimile. Background technique [0002] In the existing image forming apparatus using the inkjet method, the printing medium is conveyed intermittently in the sub-scanning direction, and during the stay of the printing medium, the printing carriage with a plurality of recording heads is moved perpendicular to the sub-scanning direction. It reciprocates in the main scanning direction, and at the same time, after the ink is ejected into the printing medium through the recording head, an image is formed in the printing medium. [0003] The recording head has a plurality of nozzle rows in which a plurality of nozzles ejecting ink are arranged in a straight line, and in order to obtain a good image, it is very important that the nozzle rows of each recording head in the printing vehicle be located in a positional relationship determined by ...

AI Technical Summary

Problems solved by technology

[0009] (1) However, the printing car has the characteristics of intense vibration when printing

On the other hand, in the technique of (A) above, in order to rotate and adjust the eccentric cam, the camshaft needs to have a gap for rotation at its front and part, and the positional deviation of the recording head is caused by shaking between the gaps. may affect image quality

[0010] (2) In the technique of (B) above, by the friction of the tapered surface of the X stopper pressed by the spring between the side end portion of the recording head and the inclined block, the instability of the up and down motion of the X stopper may be caused, Because the position of the recording head will shake with the vibration of recording, it may affect the image quality

However, none of the above (A) and (B) can be applied to "adjust the height direction of the recording head according to the thickness of the printing medium".

[0012] (4) Even if the techniques of (A) and (B) above are applied to the "mechanism for adjusting the height direction of the recording head", the camshaft of the eccentric cam is in the gap of the shaft fitting part due to the lifting and lowering of the recording head Can tilt, causing positional deviation

In addition, due to the repeated lifting action of the recording head, the problem of damage caused by long-term wear caused by friction between the eccentric cam and the object in contact with it should also be considered

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