US 2015/0306870 A1 · HEAD ADJUSTMENT METHOD, HEAD-DRIVING DEVICE AND IMAGE-FORMING DEVICE

Abstract

According to an aspect of the present invention, in a case where a part of the plurality of head modules to each of which an initial amount of correction is set is replaced, a mounting position of the replaced head module in the first direction varies in a range within the mounting tolerance. However, the initial amount of correction in the first direction of each of the head modules is set by adding the amount of the offset more than the mounting tolerance, a mounting position of the replaced head module is always upstream from the offset reference line in the feeding direction of a recording medium. Thus, it is required to correct only an amount of correction of the replaced head module with reference to the offset reference line, so that the amount of correction of a non-replaced head module can be used without being corrected.

Claims18

Dependent claims

A head adjustment method for adjusting a recording position of each of a plurality of head modules of a line head formed by a combination of the plurality of head modules, the head adjustment method comprising the steps of:

measuring an amount of misregistration for each of the head modules, corresponding to an amount of relative misregistration of each of the head modules in a direction parallel to a feeding direction of a recording medium, with reference to a position of a slowest module among the plurality of head modules, the slowest module being arranged on a most downstream side in the feeding direction of the recording medium with respect to a line head;
determining an amount of correction of each of the head modules by determining a value corresponding to an amount in which an amount of an offset more than a mounting tolerance of the head modules in the direction parallel to the feeding direction is added to the amount of misregistration measured for each of the head modules;
storing the amount of correction in a storage unit;
and
controlling recording timing of each of the head modules on a basis of the amount of correction stored in the storage unit.

2 more elements

A head-driving device that controls a recording operation of each of a plurality of head modules of a line head formed by a combination of the plurality of head modules, the head-driving device comprising:

a storage unit that stores an amount of correction of each of the head modules that is a value corresponding to an amount acquired by adding an amount of an offset more than a mounting tolerance of the head modules in a direction parallel to the feeding direction to an amount of misregistration for each of the head modules corresponding to an amount of relative misregistration for each of the head modules in the direction parallel to the feeding direction that is acquired with reference to a position of a slowest module among the plurality of head modules, the slowest module being arranged on a most downstream side in the feeding direction of the recording medium with respect to the line head;
and
a timing control unit that controls recording timing of the head modules on a basis of the amount of correction stored in the storage unit.

Dependencies are inferred from the claim text.

Head adjustment method, head-driving device and image-forming device

Life of this patent

Head adjustment method, head-driving device and image-forming device

Life of this patent

Abstract

Claims18